In the year before the
First Council of Constantinople
The First Council of Constantinople (; ) was a council of Christian bishops convened in Constantinople (now Istanbul, Turkey) in AD 381 by the Roman Emperor Theodosius I. This second ecumenical council, an effort to attain consensus in the ...
in 381,
Nicean Christianity became the official religion of the
Roman Empire
The Roman Empire ruled the Mediterranean and much of Europe, Western Asia and North Africa. The Roman people, Romans conquered most of this during the Roman Republic, Republic, and it was ruled by emperors following Octavian's assumption of ...
when
Theodosius I
Theodosius I ( ; 11 January 347 – 17 January 395), also known as Theodosius the Great, was Roman emperor from 379 to 395. He won two civil wars and was instrumental in establishing the Nicene Creed as the orthodox doctrine for Nicene C ...
, emperor of the East,
Gratian, emperor of the West, and Gratian's junior co-ruler
Valentinian II issued the
Edict of Thessalonica
An edict is a decree or announcement of a law, often associated with monarchies, but it can be under any official authority. Synonyms include "dictum" and "pronouncement". ''Edict'' derives from the Latin wikt:edictum#Latin, edictum.
Notable ed ...
in 380, which recognized the
catholic
The Catholic Church (), also known as the Roman Catholic Church, is the List of Christian denominations by number of members, largest Christian church, with 1.27 to 1.41 billion baptized Catholics Catholic Church by country, worldwid ...
orthodoxy
Orthodoxy () is adherence to a purported "correct" or otherwise mainstream- or classically-accepted creed, especially in religion.
Orthodoxy within Christianity refers to acceptance of the doctrines defined by various creeds and ecumenical co ...
, as defined by the
Council of Nicea, as the Roman Empire's
state religion. Historians refer to the imperial church in a variety of ways: as the catholic church, the orthodox church, the imperial church, the Roman church, or the Byzantine church, although some of those terms are also used for wider communions extending outside the Roman Empire. The
Eastern Orthodox Church
The Eastern Orthodox Church, officially the Orthodox Catholic Church, and also called the Greek Orthodox Church or simply the Orthodox Church, is List of Christian denominations by number of members, one of the three major doctrinal and ...
,
Oriental Orthodoxy, and the
Catholic Church
The Catholic Church (), also known as the Roman Catholic Church, is the List of Christian denominations by number of members, largest Christian church, with 1.27 to 1.41 billion baptized Catholics Catholic Church by country, worldwid ...
all claim to stand in continuity from the Nicene church to which Theodosius granted recognition. Political differences between the Eastern Roman Empire and the Persian
Sassanid Empire
The Sasanian Empire (), officially Eranshahr ( , "Empire of the Iranians"), was an Iranian empire that was founded and ruled by the House of Sasan from 224 to 651. Enduring for over four centuries, the length of the Sasanian dynasty's reign ...
led to the separation of the
Church of the East
The Church of the East ( ) or the East Syriac Church, also called the Church of Seleucia-Ctesiphon, the Persian Church, the Assyrian Church, the Babylonian Church, the Chaldean Church or the Nestorian Church, is one of three major branches o ...
in 424. Doctrinal split within the Roman imperial church led to the independence of the early Oriental Orthodoxy. The fall of the Western Roman Empire initiated the gradual separation between
Eastern and
Western Christianity
Western Christianity is one of two subdivisions of Christianity (Eastern Christianity being the other). Western Christianity is composed of the Latin Church and Protestantism, Western Protestantism, together with their offshoots such as the O ...
, which culminated in the
East-West schism of 1054. The Western church evolved into the
Latin Catholic Church while the Eastern church body that remained under the patronage of the Eastern empire evolved into the
Greek Orthodox Church
Greek Orthodox Church (, , ) is a term that can refer to any one of three classes of Christian Churches, each associated in some way with Christianity in Greece, Greek Christianity, Antiochian Greek Christians, Levantine Arabic-speaking Christian ...
.
Earlier in the 4th century, following the
Diocletianic Persecution of 303–313 and the
Donatist controversy that arose in consequence,
Constantine the Great
Constantine I (27 February 27222 May 337), also known as Constantine the Great, was a Roman emperor from AD 306 to 337 and the first Roman emperor to convert to Christianity. He played a Constantine the Great and Christianity, pivotal ro ...
had convened councils of bishops to define the
orthodoxy
Orthodoxy () is adherence to a purported "correct" or otherwise mainstream- or classically-accepted creed, especially in religion.
Orthodoxy within Christianity refers to acceptance of the doctrines defined by various creeds and ecumenical co ...
of the Christian faith and to expand on earlier Christian councils. A series of
ecumenical councils convened by successive Roman emperors met during the 4th and the 5th centuries, but Christianity continued to suffer rifts and schisms surrounding the
theological and
christological doctrines of
Arianism
Arianism (, ) is a Christology, Christological doctrine which rejects the traditional notion of the Trinity and considers Jesus to be a creation of God, and therefore distinct from God. It is named after its major proponent, Arius (). It is co ...
,
Nestorianism
Nestorianism is a term used in Christian theology and Church history to refer to several mutually related but doctrinary, doctrinarily distinct sets of teachings. The first meaning of the term is related to the original teachings of Christian t ...
,
Miaphysitism
Miaphysitism () is the Christological doctrine that holds Jesus, the Incarnate Word, is fully divine and fully human, in one nature ('' physis'', ). It is a position held by the Oriental Orthodox Churches. It differs from the Dyophysitism of ...
, and
Dyophysitism. In the 5th century, the
Western Roman Empire
In modern historiography, the Western Roman Empire was the western provinces of the Roman Empire, collectively, during any period in which they were administered separately from the eastern provinces by a separate, independent imperial court. ...
decayed as a
polity
A polity is a group of people with a collective identity, who are organized by some form of political Institutionalisation, institutionalized social relations, and have a capacity to mobilize resources.
A polity can be any group of people org ...
; invaders sacked
Rome
Rome (Italian language, Italian and , ) is the capital city and most populated (municipality) of Italy. It is also the administrative centre of the Lazio Regions of Italy, region and of the Metropolitan City of Rome. A special named with 2, ...
in
410 and in
455, and
Odoacer, an Arian barbarian warlord, forced
Romulus Augustus, the last nominal Western Emperor,
to abdicate in 476. However, apart from the aforementioned schisms, the church as an institution persisted in
communion, if not without tension, between the
East
East is one of the four cardinal directions or points of the compass. It is the opposite direction from west and is the direction from which the Sun rises on the Earth.
Etymology
As in other languages, the word is formed from the fact that ea ...
and
West. In the 6th century, the
Byzantine armies of the
Byzantine Emperor
The foundation of Constantinople in 330 AD marks the conventional start of the Eastern Roman Empire, which Fall of Constantinople, fell to the Ottoman Empire in 1453 AD. Only the emperors who were recognized as legitimate rulers and exercised s ...
Justinian I
Justinian I (, ; 48214 November 565), also known as Justinian the Great, was Roman emperor from 527 to 565.
His reign was marked by the ambitious but only partly realized ''renovatio imperii'', or "restoration of the Empire". This ambition was ...
recovered Italy and other regions of the Western Mediterranean shore. The
Byzantine Empire
The Byzantine Empire, also known as the Eastern Roman Empire, was the continuation of the Roman Empire centred on Constantinople during late antiquity and the Middle Ages. Having survived History of the Roman Empire, the events that caused the ...
soon lost most of these gains, but it held Rome, as part of the
Exarchate of Ravenna, until 751, a period known in
church history as the
Byzantine Papacy. The
early Muslim conquests
The early Muslim conquests or early Islamic conquests (), also known as the Arab conquests, were initiated in the 7th century by Muhammad, the founder of Islam. He established the first Islamic state in Medina, Arabian Peninsula, Arabia that ...
of the 7th–9th centuries would begin
a process of converting most of the
then-Christian world in
the Levant,
Middle East
The Middle East (term originally coined in English language) is a geopolitical region encompassing the Arabian Peninsula, the Levant, Turkey, Egypt, Iran, and Iraq.
The term came into widespread usage by the United Kingdom and western Eur ...
,
North Africa
North Africa (sometimes Northern Africa) is a region encompassing the northern portion of the African continent. There is no singularly accepted scope for the region. However, it is sometimes defined as stretching from the Atlantic shores of t ...
, regions of
Southern Italy
Southern Italy (, , or , ; ; ), also known as () or (; ; ; ), is a macroregion of Italy consisting of its southern Regions of Italy, regions.
The term "" today mostly refers to the regions that are associated with the people, lands or cultu ...
and the
Iberian Peninsula
The Iberian Peninsula ( ), also known as Iberia, is a peninsula in south-western Europe. Mostly separated from the rest of the European landmass by the Pyrenees, it includes the territories of peninsular Spain and Continental Portugal, comprisin ...
to
Islam
Islam is an Abrahamic religions, Abrahamic monotheistic religion based on the Quran, and the teachings of Muhammad. Adherents of Islam are called Muslims, who are estimated to number Islam by country, 2 billion worldwide and are the world ...
, severely restricting the reach both of the Byzantine Empire and of its church.
Christian missionary activity directed from the capital of
Constantinople
Constantinople (#Names of Constantinople, see other names) was a historical city located on the Bosporus that served as the capital of the Roman Empire, Roman, Byzantine Empire, Byzantine, Latin Empire, Latin, and Ottoman Empire, Ottoman empire ...
did not lead to a lasting expansion of the formal link between the church and the Byzantine emperor, since areas outside the Byzantine Empire's political and military control set up their own distinct churches, as in the case of
Bulgaria
Bulgaria, officially the Republic of Bulgaria, is a country in Southeast Europe. It is situated on the eastern portion of the Balkans directly south of the Danube river and west of the Black Sea. Bulgaria is bordered by Greece and Turkey t ...
in 919.
Justinian I
Justinian I (, ; 48214 November 565), also known as Justinian the Great, was Roman emperor from 527 to 565.
His reign was marked by the ambitious but only partly realized ''renovatio imperii'', or "restoration of the Empire". This ambition was ...
, who became emperor in 527, recognized the
patriarch
The highest-ranking bishops in Eastern Orthodoxy, Oriental Orthodoxy, the Roman Catholic Church (above major archbishop and primate), the Hussite Church, Church of the East, and some Independent Catholic Churches are termed patriarchs (and ...
s of
Rome
Rome (Italian language, Italian and , ) is the capital city and most populated (municipality) of Italy. It is also the administrative centre of the Lazio Regions of Italy, region and of the Metropolitan City of Rome. A special named with 2, ...
,
Constantinople
Constantinople (#Names of Constantinople, see other names) was a historical city located on the Bosporus that served as the capital of the Roman Empire, Roman, Byzantine Empire, Byzantine, Latin Empire, Latin, and Ottoman Empire, Ottoman empire ...
,
Alexandria
Alexandria ( ; ) is the List of cities and towns in Egypt#Largest cities, second largest city in Egypt and the List of coastal settlements of the Mediterranean Sea, largest city on the Mediterranean coast. It lies at the western edge of the Nile ...
,
Antioch
Antioch on the Orontes (; , ) "Antioch on Daphne"; or "Antioch the Great"; ; ; ; ; ; ; . was a Hellenistic Greek city founded by Seleucus I Nicator in 300 BC. One of the most important Greek cities of the Hellenistic period, it served as ...
, and
Jerusalem
Jerusalem is a city in the Southern Levant, on a plateau in the Judaean Mountains between the Mediterranean Sea, Mediterranean and the Dead Sea. It is one of the List of oldest continuously inhabited cities, oldest cities in the world, and ...
as the supreme authorities in the state-sponsored
Chalcedonian church apparatus (see the
Pentarchy). However, Justinian claimed "
the right and duty of regulating by his laws the minutest details of worship and discipline, and also of dictating the theological opinions to be held in the Church".
In Justinian's day, the Christian church was not entirely under the emperor's control even in the East: the Oriental Orthodox Churches had seceded, having rejected the
Council of Chalcedon in 451, and called the adherents of the imperially-recognized church "
Melkites", from Syriac ''malkâniya'' ("imperial"). In
Western Europe
Western Europe is the western region of Europe. The region's extent varies depending on context.
The concept of "the West" appeared in Europe in juxtaposition to "the East" and originally applied to the Western half of the ancient Mediterranean ...
, Christianity was mostly subject to the laws and customs of nations that owed no allegiance to the emperor in Constantinople.
[Ayer (1913), pp. 538–539] While
Eastern-born popes appointed or at least confirmed by the emperor continued to be loyal to him as their political lord, they refused to accept his authority in religious matters, or the authority of such a council as the imperially convoked
Council of Hieria of 754.
Pope Gregory III (731–741) was the last Bishop of Rome to ask the Byzantine ruler to ratify his election. With the crowning of
Charlemagne
Charlemagne ( ; 2 April 748 – 28 January 814) was List of Frankish kings, King of the Franks from 768, List of kings of the Lombards, King of the Lombards from 774, and Holy Roman Emperor, Emperor of what is now known as the Carolingian ...
by
Pope Leo III on
25 December 800 as ''
Imperator Romanorum
The Holy Roman Emperor, originally and officially the Emperor of the Romans (disambiguation), Emperor of the Romans (; ) during the Middle Ages, and also known as the Roman-German Emperor since the early modern period (; ), was the ruler and h ...
'', the political split between East and West became irrevocable. Spiritually,
Chalcedonian Christianity
Chalcedonian Christianity is the branches of Christianity that accept and uphold theological resolutions of the Council of Chalcedon, the fourth ecumenical council, held in AD 451. Chalcedonian Christianity accepts the Christological Definiti ...
persisted, at least in theory, as a unified entity until the
Great Schism and its formal division with the
mutual excommunication in 1054 of Rome and Constantinople. The empire finally collapsed with the
Fall of Constantinople
The Fall of Constantinople, also known as the Conquest of Constantinople, was the capture of Constantinople, the capital of the Byzantine Empire by the Ottoman Empire. The city was captured on 29 May 1453 as part of the culmination of a 55-da ...
to the Islamic
Ottoman Turks
The Ottoman Turks () were a Turkic peoples, Turkic ethnic group in Anatolia. Originally from Central Asia, they migrated to Anatolia in the 13th century and founded the Ottoman Empire, in which they remained socio-politically dominant for the e ...
in 1453.
The obliteration of the empire's boundaries by
Germanic peoples
The Germanic peoples were tribal groups who lived in Northern Europe in Classical antiquity and the Early Middle Ages. In modern scholarship, they typically include not only the Roman-era ''Germani'' who lived in both ''Germania'' and parts of ...
and an outburst of missionary activity among these peoples, who had no direct links with the empire, and among
Pictic and
Celtic peoples who had never been part of the Roman Empire, fostered the idea of a universal church free from association with a particular state.
[Gerland, Ernst. "The Byzantine Empire"](_blank)
in The Catholic Encyclopedia. Vol. 3. New York: Robert Appleton Company, 1908. Retrieved 19 July 2010 On the contrary, "in the East Roman or Byzantine view, when the Roman Empire became Christian, the perfect world order willed by God had been achieved: one universal empire was sovereign, and coterminous with it was the one universal church"; and the church came, by the time of the demise of the Byzantine Empire in 1453, to merge psychologically with it to the extent that its bishops had difficulty in thinking of Nicene Christianity without an emperor.
[Schadé (2006), art. "Byzantine Church"]
The legacy of the idea of a universal church carries on in today's Catholic Church, Eastern Orthodox Church, Oriental Orthodox Churches, and the
Church of the East
The Church of the East ( ) or the East Syriac Church, also called the Church of Seleucia-Ctesiphon, the Persian Church, the Assyrian Church, the Babylonian Church, the Chaldean Church or the Nestorian Church, is one of three major branches o ...
. Many other churches, such as the
Anglican Communion
The Anglican Communion is a Christian Full communion, communion consisting of the Church of England and other autocephalous national and regional churches in full communion. The archbishop of Canterbury in England acts as a focus of unity, ...
, claim
succession to this universal church.
History
Early Christianity in relation to the state

Before the end of the 1st century, the Roman authorities recognized Christianity as a
separate religion from Judaism. The distinction, perhaps already made in practice at the time of the
Great Fire of Rome in the year 64, was given official status by the emperor
Nerva around the year 98 by granting Christians exemption from paying the ''
Fiscus Iudaicus'', the annual tax upon the Jews.
Pliny the Younger, when
propraetor
In ancient Rome, a promagistrate () was a person who was granted the power via '' prorogation'' to act in place of an ordinary magistrate in the field. This was normally ''pro consule'' or ''pro praetore'', that is, in place of a consul or praet ...
in
Bithynia in 103, assumes in his letters to
Trajan
Trajan ( ; born Marcus Ulpius Traianus, 18 September 53) was a Roman emperor from AD 98 to 117, remembered as the second of the Five Good Emperors of the Nerva–Antonine dynasty. He was a philanthropic ruler and a successful soldier ...
that because Christians do not pay the tax, they are not Jews.
[Wylen (1995). pp. 190–192.][Dunn (1999). pp. 33–34.][Boatwright (2004). p. 426.]
Since paying taxes had been one of the ways that Jews demonstrated their goodwill and loyalty toward the empire, Christians had to negotiate their own alternatives to participating in the
imperial cult
An imperial cult is a form of state religion in which an emperor or a dynasty of emperors (or rulers of another title) are worshipped as demigods or deities. "Cult (religious practice), Cult" here is used to mean "worship", not in the modern pejor ...
. Their refusal to worship the
Roman gods or to pay homage to the
emperor as divine resulted at times in persecution and martyrdom.
Church Father Tertullian
Tertullian (; ; 155 – 220 AD) was a prolific Early Christianity, early Christian author from Roman Carthage, Carthage in the Africa (Roman province), Roman province of Africa. He was the first Christian author to produce an extensive co ...
, for instance, attempted to argue that Christianity was not inherently treasonous, and that Christians could offer their own form of prayer for the well-being of the emperor.
Christianity spread especially in the eastern parts of the empire and beyond its border; in the west it was at first relatively limited, but significant Christian communities emerged in
Rome
Rome (Italian language, Italian and , ) is the capital city and most populated (municipality) of Italy. It is also the administrative centre of the Lazio Regions of Italy, region and of the Metropolitan City of Rome. A special named with 2, ...
,
Carthage
Carthage was an ancient city in Northern Africa, on the eastern side of the Lake of Tunis in what is now Tunisia. Carthage was one of the most important trading hubs of the Ancient Mediterranean and one of the most affluent cities of the classic ...
, and other urban centers, becoming by the end of the
3rd century, the dominant faith in some of them. Christians accounted for approximately 10% of the Roman population by 300, according to some estimates. Christianity then rapidly grew in the 4th century -
Rodney Stark estimated that Christians accounted for 56.5% of the Roman population by 350. According to
Will Durant, the
Christian Church
In ecclesiology, the Christian Church is what different Christian denominations conceive of as being the true body of Christians or the original institution established by Jesus Christ. "Christian Church" has also been used in academia as a syn ...
prevailed over
paganism
Paganism (, later 'civilian') is a term first used in the fourth century by early Christians for people in the Roman Empire who practiced polytheism, or ethnic religions other than Christianity, Judaism, and Samaritanism. In the time of the ...
because it offered a much more attractive doctrine and because the church leaders addressed human needs better than their rivals.
[Durant, Will. Caesar and Christ. New York: Simon and Schuster. 1972]
In 301, the
Kingdom of Armenia, nominally a Roman client kingdom but ruled by a
Parthian dynasty, became the first nation to adopt Christianity as its
state religion, with the possible exception of
Osroene in 201.
Establishment and early controversies
In 311, with the
Edict of Serdica
The Edict of Serdica, also called Edict of Toleration by Galerius, was issued in 311 in Serdica (now Sofia, Bulgaria) by Roman Emperor Galerius. It officially ended the Diocletianic Persecution of Christianity in the Eastern Roman Empire.
T ...
the dying Emperor
Galerius
Galerius Valerius Maximianus (; Greek: Γαλέριος; 258 – May 311) was Roman emperor from 305 to 311. He participated in the system of government later known as the Tetrarchy, first acting as '' caesar'' under Emperor Diocletian. In th ...
ended the
Diocletianic Persecution that he is reputed to have instigated, and in 313, Emperor
Constantine issued the
Edict of Milan
The Edict of Milan (; , ''Diatagma tōn Mediolanōn'') was the February 313 agreement to treat Christians benevolently within the Roman Empire. Frend, W. H. C. (1965). ''The Early Church''. SPCK, p. 137. Western Roman Emperor Constantine I and ...
, granting to Christians and others "the right of open and free observance of their worship".
Constantine began to utilize Christian symbols such as the
Chi Rho
The Chi Rho (☧, English pronunciation ; also known as ''chrismon'') is one of the earliest forms of the Christogram, formed by superimposing the first two (capital) letters—chi (letter), chi and rho (ΧΡ)—of the Greek (Romanization of ...
early in his reign but still encouraged traditional Roman religious practices including
sun worship. In 330, Constantine established the city of
Constantinople
Constantinople (#Names of Constantinople, see other names) was a historical city located on the Bosporus that served as the capital of the Roman Empire, Roman, Byzantine Empire, Byzantine, Latin Empire, Latin, and Ottoman Empire, Ottoman empire ...
as the new capital of the Roman Empire. The city would gradually come to be seen as the intellectual and cultural center of the
Christian world.
Over the course of the
4th century the Christian body became consumed by debates surrounding
orthodoxy
Orthodoxy () is adherence to a purported "correct" or otherwise mainstream- or classically-accepted creed, especially in religion.
Orthodoxy within Christianity refers to acceptance of the doctrines defined by various creeds and ecumenical co ...
, i.e. which religious doctrines are the correct ones. In the early 4th century, a group in
North Africa
North Africa (sometimes Northern Africa) is a region encompassing the northern portion of the African continent. There is no singularly accepted scope for the region. However, it is sometimes defined as stretching from the Atlantic shores of t ...
, later called
Donatists, who believed in a very rigid interpretation of Christianity that excluded many
who had abandoned the faith during the Diocletianic Persecution, created a crisis in the
western empire.
A
synod
A synod () is a council of a Christian denomination, usually convened to decide an issue of doctrine, administration or application. The word '' synod'' comes from the Ancient Greek () ; the term is analogous with the Latin word . Originally, ...
was held in
Rome in 313, followed by another in
Arles in 314. These synods ruled that the Donatist faith was heresy and, when the Donatists refused to recant, Constantine launched the first campaign of persecution by Christians against Christians, and began imperial involvement in Christian theology. However, during the reign of Emperor
Julian the Apostate, the Donatists, who formed the majority party in the Roman province of Africa for 30 years, were given official approval.
Debates within Christianity
Christian scholars and populace within the empire were increasingly embroiled in debates regarding
christology
In Christianity, Christology is a branch of Christian theology, theology that concerns Jesus. Different denominations have different opinions on questions such as whether Jesus was human, divine, or both, and as a messiah what his role would b ...
(i.e., regarding the nature of the
Christ
Jesus ( AD 30 or 33), also referred to as Jesus Christ, Jesus of Nazareth, and many other names and titles, was a 1st-century Jewish preacher and religious leader. He is the Jesus in Christianity, central figure of Christianity, the M ...
). Opinions ranged from belief that Jesus was
entirely human to belief that he was
entirely divine. The most persistent debate was that between the
homoousian view (the Father and the Son are of one substance), defined at the
Council at Nicaea in 325 and later championed by
Athanasius of Alexandria
Athanasius I of Alexandria ( – 2 May 373), also called Athanasius the Great, Athanasius the Confessor, or, among Coptic Christians, Athanasius the Apostolic, was a Christian theologian and the 20th patriarch of Alexandria (as Athanasius ...
, and the
Arian view (the Father and the Son are similar, but the Father is greater than the Son). Emperors thereby became ever more involved with the increasingly divided early Church.
Constantine backed the Nicene Creed of Nicaea, but was baptized on his deathbed by the
Eusebius of Nicomedia, a bishop with Arian sympathies. His successor
Constantius II
Constantius II (; ; 7 August 317 – 3 November 361) was Roman emperor from 337 to 361. His reign saw constant warfare on the borders against the Sasanian Empire and Germanic peoples, while internally the Roman Empire went through repeated civ ...
supported Arian positions: under his rule, the
Council of Constantinople in 360 supported the Arian view. After the interlude of Emperor
Julian, who wanted to return to the pagan Roman/Greek religion, the west stuck to the Nicene Creed, while Arianism or
Semi-Arianism was dominant in the east (under Emperor Valens), until Emperor Theodosius I called the
Council of Constantinople in 381, which reasserted the Nicene view and rejected the Arian view. This council further refined the definition of orthodoxy, issuing the
Nicene-Constantinopolitan Creed.

On 27 February of the previous year, Theodosius I established, with the
Edict of Thessalonica
An edict is a decree or announcement of a law, often associated with monarchies, but it can be under any official authority. Synonyms include "dictum" and "pronouncement". ''Edict'' derives from the Latin wikt:edictum#Latin, edictum.
Notable ed ...
, the Christianity of the
First Council of Nicaea
The First Council of Nicaea ( ; ) was a council of Christian bishops convened in the Bithynian city of Nicaea (now İznik, Turkey) by the Roman Emperor Constantine I. The Council of Nicaea met from May until the end of July 325.
This ec ...
as the official
state religion, reserving for its followers the title of Catholic Christians and declaring that those who did not follow the religion taught by
Pope Damasus I of Rome and
Pope Peter of Alexandria were to be called
heretics:
In 391, Theodosius closed all the "pagan" (non-Christian and non-Jewish) temples and formally forbade pagan worship.
Late antiquity

At the end of the 4th century the Roman Empire had effectively split into two parts although their economies and the imperial-recognized church were still strongly tied. The two halves of the empire had always had cultural differences, exemplified in particular by the widespread use of the
Greek language
Greek (, ; , ) is an Indo-European languages, Indo-European language, constituting an independent Hellenic languages, Hellenic branch within the Indo-European language family. It is native to Greece, Cyprus, Italy (in Calabria and Salento), south ...
in the Eastern Empire and its more limited use in the West (Greek, as well as
Latin
Latin ( or ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally spoken by the Latins (Italic tribe), Latins in Latium (now known as Lazio), the lower Tiber area aroun ...
, was used in the West, but Latin was the spoken
vernacular
Vernacular is the ordinary, informal, spoken language, spoken form of language, particularly when perceptual dialectology, perceived as having lower social status or less Prestige (sociolinguistics), prestige than standard language, which is mor ...
).
By the time Christianity became the state religion of the empire at the end of the 4th century, scholars in the West had largely abandoned Greek in favor of Latin. Even the Church in Rome, where Greek continued to be used in the
liturgy
Liturgy is the customary public ritual of worship performed by a religious group. As a religious phenomenon, liturgy represents a communal response to and participation in the sacred through activities reflecting praise, thanksgiving, remembra ...
longer than in the provinces, abandoned Greek.
Jerome
Jerome (; ; ; – 30 September 420), also known as Jerome of Stridon, was an early Christian presbyter, priest, Confessor of the Faith, confessor, theologian, translator, and historian; he is commonly known as Saint Jerome.
He is best known ...
's
Vulgate
The Vulgate () is a late-4th-century Bible translations into Latin, Latin translation of the Bible. It is largely the work of Saint Jerome who, in 382, had been commissioned by Pope Damasus I to revise the Gospels used by the Diocese of ...
had begun to replace the
older Latin translations of the Bible.

The
5th century would see the further fracturing of Christendom. Emperor
Theodosius II called two synods in
Ephesus
Ephesus (; ; ; may ultimately derive from ) was an Ancient Greece, ancient Greek city on the coast of Ionia, in present-day Selçuk in İzmir Province, Turkey. It was built in the 10th century BC on the site of Apasa, the former Arzawan capital ...
, one in 431 and one in 449, the
first of which condemned the teachings of Patriarch
Nestorius
Nestorius of Constantinople (; ; ) was an early Christian prelate who served as Archbishop of Constantinople from 10 April 428 to 11 July 431. A Christian theologian from the Catechetical School of Antioch, several of his teachings in the fi ...
of Constantinople, while the second supported the teachings of
Eutyches
Eutyches (; c. 375–454) or Eutyches of Constantinople against
Archbishop Flavian of Constantinople.
[Price (2005), p. 52]
Nestorius taught that Christ's divine and human nature were distinct persons, and hence
Mary was the mother of Christ but not the mother of God. Eutyches taught on the contrary that there was in Christ only a single nature, different from that of human beings in general. The
First Council of Ephesus rejected Nestorius' view, causing churches centered around the
School of Edessa
The School of Edessa () was a Christian theology, Christian theological school of great importance to the Syriac language, Syriac-speaking world. It had been founded as long ago as the 2nd century by the kings of the Abgarid dynasty, Abgar dynasty. ...
, a city at the edge of the empire, to break with the imperial church (see
Nestorian schism).
Persecuted within the Roman Empire, many Nestorians fled to
Persia
Iran, officially the Islamic Republic of Iran (IRI) and also known as Persia, is a country in West Asia. It borders Iraq to the west, Turkey, Azerbaijan, and Armenia to the northwest, the Caspian Sea to the north, Turkmenistan to the nort ...
and joined the
Sassanid
The Sasanian Empire (), officially Eranshahr ( , "Empire of the Iranian peoples, Iranians"), was an List of monarchs of Iran, Iranian empire that was founded and ruled by the House of Sasan from 224 to 651. Enduring for over four centuries, th ...
Church (the future
Church of the East
The Church of the East ( ) or the East Syriac Church, also called the Church of Seleucia-Ctesiphon, the Persian Church, the Assyrian Church, the Babylonian Church, the Chaldean Church or the Nestorian Church, is one of three major branches o ...
). The
Second Council of Ephesus upheld the view of Eutyches, but was overturned two years later by the
Council of Chalcedon, called by Emperor
Marcian. Rejection of the Council of Chalcedon led to the exodus from the state church of the majority of Christians in Egypt and many in the Levant, who preferred
Miaphysite theology.
Thus, within a century of the link established by Theodosius between the emperor and the church in his empire, it suffered a significant diminishment. Those who upheld the Council of Chalcedon became known in
Syriac as
Melkites, the ''imperial'' group, followers of the ''emperor'' (in Syriac, ''malka''). This schism resulted in an independent communion of churches, including the Egyptian, Syrian, Ethiopian and Armenian churches, that is today known as
Oriental Orthodoxy. In spite of these schisms, however, the Chalcedonian Nicene church still represented the majority of Christians within the by now already diminished Roman Empire.
End of the Western Roman Empire

In the 5th century, the Western Empire rapidly
decayed and by the end of the century was no more. Within a few decades,
Germanic tribes
The Germanic peoples were tribal groups who lived in Northern Europe in Classical antiquity and the Early Middle Ages. In modern scholarship, they typically include not only the Roman-era ''Germani'' who lived in both ''Germania'' and parts ...
, particularly the
Goths
The Goths were a Germanic people who played a major role in the fall of the Western Roman Empire and the emergence of medieval Europe. They were first reported by Graeco-Roman authors in the 3rd century AD, living north of the Danube in what is ...
and
Vandals
The Vandals were a Germanic people who were first reported in the written records as inhabitants of what is now Poland, during the period of the Roman Empire. Much later, in the fifth century, a group of Vandals led by kings established Vand ...
, conquered the western provinces. Rome was sacked in
410 and
455, and was to be sacked again in the following century in
546.
By 476, the Germanic chieftain
Odoacer had conquered
Italy
Italy, officially the Italian Republic, is a country in Southern Europe, Southern and Western Europe, Western Europe. It consists of Italian Peninsula, a peninsula that extends into the Mediterranean Sea, with the Alps on its northern land b ...
and deposed the last western emperor,
Romulus Augustus, though he nominally submitted to the authority of Constantinople. The Arian Germanic tribes established their own systems of churches and bishops in the western provinces but were generally tolerant of the population who chose to remain in communion with the imperial church.
In 533, Roman Emperor
Justinian
Justinian I (, ; 48214 November 565), also known as Justinian the Great, was Roman emperor from 527 to 565.
His reign was marked by the ambitious but only partly realized ''renovatio imperii'', or "restoration of the Empire". This ambition was ...
in Constantinople launched a military campaign to reclaim the western provinces from the Arian Germans, starting with
North Africa
North Africa (sometimes Northern Africa) is a region encompassing the northern portion of the African continent. There is no singularly accepted scope for the region. However, it is sometimes defined as stretching from the Atlantic shores of t ...
and proceeding to Italy. His success in recapturing much of the western Mediterranean was temporary. The empire soon lost most of these gains, but held Rome, as part of the
Exarchate of Ravenna, until 751.
Justinian definitively established
Caesaropapism,
[Ayer (1913), p. 538] believing "he had the right and duty of regulating by his laws the minutest details of worship and discipline, and also of dictating the theological opinions to be held in the Church".
[Ayer (1913), p. 553] According to the entry in
Liddell & Scott
Liddell is a surname. Notable people with this name, also Lidell, include:
* Alan Liddell (1930–1972), English cricketer, son of Allan Liddell
* Alice Liddell (1852–1934), Lewis Carroll's "muse"
* Allan Liddell (1908–1970), English cricke ...
, the term ''
orthodox'' first occurs in the
Codex Justinianus: "We direct that all Catholic churches, throughout the entire world, shall be placed under the control of the orthodox bishops who have embraced the Nicene Creed."
By the end of the 6th century the church within the Empire had become firmly tied with the imperial government, while in the west Christianity was mostly subject to the laws and customs of nations that owed no allegiance to the emperor.
Patriarchates in the Empire

Emperor
Justinian I
Justinian I (, ; 48214 November 565), also known as Justinian the Great, was Roman emperor from 527 to 565.
His reign was marked by the ambitious but only partly realized ''renovatio imperii'', or "restoration of the Empire". This ambition was ...
assigned to five sees, those of
Rome
Rome (Italian language, Italian and , ) is the capital city and most populated (municipality) of Italy. It is also the administrative centre of the Lazio Regions of Italy, region and of the Metropolitan City of Rome. A special named with 2, ...
,
Constantinople
Constantinople (#Names of Constantinople, see other names) was a historical city located on the Bosporus that served as the capital of the Roman Empire, Roman, Byzantine Empire, Byzantine, Latin Empire, Latin, and Ottoman Empire, Ottoman empire ...
,
Alexandria
Alexandria ( ; ) is the List of cities and towns in Egypt#Largest cities, second largest city in Egypt and the List of coastal settlements of the Mediterranean Sea, largest city on the Mediterranean coast. It lies at the western edge of the Nile ...
,
Antioch
Antioch on the Orontes (; , ) "Antioch on Daphne"; or "Antioch the Great"; ; ; ; ; ; ; . was a Hellenistic Greek city founded by Seleucus I Nicator in 300 BC. One of the most important Greek cities of the Hellenistic period, it served as ...
and
Jerusalem
Jerusalem is a city in the Southern Levant, on a plateau in the Judaean Mountains between the Mediterranean Sea, Mediterranean and the Dead Sea. It is one of the List of oldest continuously inhabited cities, oldest cities in the world, and ...
, a superior ecclesial authority that covered the whole of his empire. The
First Council of Nicaea
The First Council of Nicaea ( ; ) was a council of Christian bishops convened in the Bithynian city of Nicaea (now İznik, Turkey) by the Roman Emperor Constantine I. The Council of Nicaea met from May until the end of July 325.
This ec ...
in 325 reaffirmed that the bishop of a provincial capital, the metropolitan bishop, had a certain authority over the bishops of the province. But it also recognized the existing supra-metropolitan authority of the sees of Rome, Alexandria and Antioch, and granted special recognition to Jerusalem.
Constantinople was added at the
First Council of Constantinople
The First Council of Constantinople (; ) was a council of Christian bishops convened in Constantinople (now Istanbul, Turkey) in AD 381 by the Roman Emperor Theodosius I. This second ecumenical council, an effort to attain consensus in the ...
(381) and given authority initially only over
Thrace
Thrace (, ; ; ; ) is a geographical and historical region in Southeast Europe roughly corresponding to the province of Thrace in the Roman Empire. Bounded by the Balkan Mountains to the north, the Aegean Sea to the south, and the Black Se ...
. By a canon of contested validity, the
Council of Chalcedon (451) placed
Asia
Asia ( , ) is the largest continent in the world by both land area and population. It covers an area of more than 44 million square kilometres, about 30% of Earth's total land area and 8% of Earth's total surface area. The continent, which ...
and
Pontus, which together made up
Anatolia
Anatolia (), also known as Asia Minor, is a peninsula in West Asia that makes up the majority of the land area of Turkey. It is the westernmost protrusion of Asia and is geographically bounded by the Mediterranean Sea to the south, the Aegean ...
, under Constantinople, although their autonomy had been recognized at the council of 381.
Rome never recognized this
pentarchy of five sees as constituting the leadership of the church. It maintained that, in accordance with the First Council of Nicaea, only the three "
Petrine" sees of Rome, Alexandria and Antioch had a real patriarchal function. The canons of the
Quinisext Council of 692, which gave ecclesiastical sanction to Justinian's decree, were also never fully accepted by the Western Church.
Early Muslim conquests
The early Muslim conquests or early Islamic conquests (), also known as the Arab conquests, were initiated in the 7th century by Muhammad, the founder of Islam. He established the first Islamic state in Medina, Arabian Peninsula, Arabia that ...
of the territories of the patriarchates of Alexandria, Antioch and Jerusalem, most of whose Christians were in any case lost to the orthodox church since the aftermath of the Council of Chalcedon, left in effect only two patriarchates, those of Rome and Constantinople. In 732, Emperor
Leo III's
iconoclast policies were resisted by
Pope Gregory III. The Emperor reacted by transferring to the ecclesiastical jurisdiction of Constantinople in 740 the territories in
Greece
Greece, officially the Hellenic Republic, is a country in Southeast Europe. Located on the southern tip of the Balkan peninsula, it shares land borders with Albania to the northwest, North Macedonia and Bulgaria to the north, and Turkey to th ...
,
Illyria,
Sicily
Sicily (Italian language, Italian and ), officially the Sicilian Region (), is an island in the central Mediterranean Sea, south of the Italian Peninsula in continental Europe and is one of the 20 regions of Italy, regions of Italy. With 4. ...
and
Calabria
Calabria is a Regions of Italy, region in Southern Italy. It is a peninsula bordered by the region Basilicata to the north, the Ionian Sea to the east, the Strait of Messina to the southwest, which separates it from Sicily, and the Tyrrhenian S ...
that had been under Rome (see map), leaving the bishop of Rome with only a minute part of the lands over which the empire still had control.
The Patriarch of Constantinople had already adopted the title of "ecumenical patriarch", indicating what he saw as his position in the ''oikoumene'', the Christian world ideally headed by the emperor and the patriarch of the emperor's capital. Also under the influence of the
imperial model of governance of the state church, in which "the emperor becomes the actual executive organ of the universal Church",
the pentarchy model of governance of the state church regressed to a monarchy of the Patriarch of Constantinople.
[
]
Rise of Islam
The Rashidun conquests began to expand the sway of Islam
Islam is an Abrahamic religions, Abrahamic monotheistic religion based on the Quran, and the teachings of Muhammad. Adherents of Islam are called Muslims, who are estimated to number Islam by country, 2 billion worldwide and are the world ...
beyond Arabia
The Arabian Peninsula (, , or , , ) or Arabia, is a peninsula in West Asia, situated north-east of Africa on the Arabian plate. At , comparable in size to India, the Arabian Peninsula is the largest peninsula in the world.
Geographically, the ...
in the 7th century, first clashing with the Roman Empire in 634. That empire and the Sassanid Persian Empire were at that time crippled by decades of war between them. By the late 8th century the Umayyad caliphate
The Umayyad Caliphate or Umayyad Empire (, ; ) was the second caliphate established after the death of the Islamic prophet Muhammad and was ruled by the Umayyad dynasty. Uthman ibn Affan, the third of the Rashidun caliphs, was also a member o ...
had conquered all of Persia
Iran, officially the Islamic Republic of Iran (IRI) and also known as Persia, is a country in West Asia. It borders Iraq to the west, Turkey, Azerbaijan, and Armenia to the northwest, the Caspian Sea to the north, Turkmenistan to the nort ...
and much of the Byzantine
The Byzantine Empire, also known as the Eastern Roman Empire, was the continuation of the Roman Empire centred on Constantinople during late antiquity and the Middle Ages. Having survived the events that caused the fall of the Western Roman E ...
territory including Egypt
Egypt ( , ), officially the Arab Republic of Egypt, is a country spanning the Northeast Africa, northeast corner of Africa and Western Asia, southwest corner of Asia via the Sinai Peninsula. It is bordered by the Mediterranean Sea to northe ...
, Palestine
Palestine, officially the State of Palestine, is a country in West Asia. Recognized by International recognition of Palestine, 147 of the UN's 193 member states, it encompasses the Israeli-occupied West Bank, including East Jerusalem, and th ...
, and Syria
Syria, officially the Syrian Arab Republic, is a country in West Asia located in the Eastern Mediterranean and the Levant. It borders the Mediterranean Sea to the west, Turkey to Syria–Turkey border, the north, Iraq to Iraq–Syria border, t ...
.
Suddenly, much of the Christian world was under Muslim rule. Over the coming centuries the successive Muslim states became some of the most powerful in the Mediterranean world.
Though the Byzantine church claimed religious authority over Christians in Egypt and the Levant
The Levant ( ) is the subregion that borders the Eastern Mediterranean, Eastern Mediterranean sea to the west, and forms the core of West Asia and the political term, Middle East, ''Middle East''. In its narrowest sense, which is in use toda ...
, in reality the majority of Christians in these regions were by then miaphysites and members of other sects. The new Muslim rulers, in contrast, offered religious tolerance to Christians of all sects. Additionally subjects of the Muslim Empire could be accepted as Muslims simply by declaring a belief in a single deity and reverence for Muhammad (see shahada). As a result, the peoples of Egypt, Palestine and Syria largely accepted their new rulers and many declared themselves Muslims within a few generations. Muslim incursions later found success in parts of Europe, particularly Spain (see Al-Andalus
Al-Andalus () was the Muslim-ruled area of the Iberian Peninsula. The name refers to the different Muslim states that controlled these territories at various times between 711 and 1492. At its greatest geographical extent, it occupied most o ...
).
Expansion of Christianity in Europe
During the 9th century, the Emperor in Constantinople encouraged missionary expeditions to nearby nations including the Muslim caliphate, and the Turkic Khazars. In 862 he sent Saints Cyril and Methodius
Cyril (; born Constantine, 826–869) and Methodius (; born Michael, 815–885) were brothers, Population of the Byzantine Empire, Byzantine Christian theologians and Christian missionaries, missionaries. For their work evangelizing the Slavs ...
to Slavic Great Moravia. By then most of the Slavic population of Bulgaria
Bulgaria, officially the Republic of Bulgaria, is a country in Southeast Europe. It is situated on the eastern portion of the Balkans directly south of the Danube river and west of the Black Sea. Bulgaria is bordered by Greece and Turkey t ...
was Christian and Tsar Boris I himself was baptized in 864. Serbia
, image_flag = Flag of Serbia.svg
, national_motto =
, image_coat = Coat of arms of Serbia.svg
, national_anthem = ()
, image_map =
, map_caption = Location of Serbia (gree ...
was accounted Christian by about 870. In early 867 Patriarch Photios I of Constantinople wrote that Christianity was accepted by the Kievan Rus'
Kievan Rus', also known as Kyivan Rus,.
* was the first East Slavs, East Slavic state and later an amalgam of principalities in Eastern Europe from the late 9th to the mid-13th century.John Channon & Robert Hudson, ''Penguin Historical At ...
, which however was definitively Christianized only at the close of the following century.
Of these, the Church in Great Moravia chose immediately to link with Rome, not Constantinople: the missionaries sent there sided with the Pope during the Photian Schism (863–867). After decisive victories over the Byzantines at Acheloos and Katasyrtai, Bulgaria declared its church autocephalous and elevated it to the rank of patriarchate, an autonomy recognized in 927 by Constantinople, but abolished by Emperor Basil II
Basil II Porphyrogenitus (; 958 – 15 December 1025), nicknamed the Bulgar Slayer (, ), was the senior Byzantine emperor from 976 to 1025. He and his brother Constantine VIII were crowned before their father Romanos II died in 963, but t ...
Bulgaroktonos (the Bulgar-Slayer) after his 1018 conquest of Bulgaria.
In Serbia, which became an independent kingdom in the early 13th century, Stephen Uroš IV Dušan, after conquering a large part of Byzantine territory in Europe and assuming the title of Tsar, raised the Serbian archbishop to the rank of patriarch in 1346, an autonomy recognized in 1375 by Constantinople, a rank maintained until after the fall of the Byzantine Empire to the Turks. No Byzantine emperor ever ruled Russian Christendom.
Expansion of the church in western and northern Europe began much earlier, with the conversion of the Irish in the 5th century, the Franks at the end of the same century, the Arian Visigoths in Spain soon afterwards, and the English at the end of the 6th century. By the time the Byzantine missions to central and eastern Europe began, Christian western Europe, in spite of losing most of Spain to Islam, encompassed Germany and part of Scandinavia, and, apart from the south of Italy, was independent of the Byzantine Empire and had been almost entirely so for centuries.
This situation fostered the idea of a universal church linked to no one particular state. Long before the Byzantine Empire came to an end, Poland
Poland, officially the Republic of Poland, is a country in Central Europe. It extends from the Baltic Sea in the north to the Sudetes and Carpathian Mountains in the south, bordered by Lithuania and Russia to the northeast, Belarus and Ukrai ...
also, Hungary
Hungary is a landlocked country in Central Europe. Spanning much of the Pannonian Basin, Carpathian Basin, it is bordered by Slovakia to the north, Ukraine to the northeast, Romania to the east and southeast, Serbia to the south, Croatia and ...
and other central European peoples were part of a church that in no way saw itself as the empire's church and that, with the East-West Schism, had even ceased to be in communion with it.
East–West Schism (1054)
With the defeat and death in 751 of the last Exarch of Ravenna and the end of the Exarchate, Rome ceased to be part of the Byzantine Empire. Forced to seek protection elsewhere, the popes turned to the Franks
file:Frankish arms.JPG, Aristocratic Frankish burial items from the Merovingian dynasty
The Franks ( or ; ; ) were originally a group of Germanic peoples who lived near the Rhine river, Rhine-river military border of Germania Inferior, which wa ...
and, with the coronation of Charlemagne
Charlemagne ( ; 2 April 748 – 28 January 814) was List of Frankish kings, King of the Franks from 768, List of kings of the Lombards, King of the Lombards from 774, and Holy Roman Emperor, Emperor of what is now known as the Carolingian ...
by Pope Leo III on 25 December 800, transferred their political allegiance to a rival Roman emperor. Disputes between the see of Rome, which claimed authority over all other sees, and that of Constantinople, which was now without rival in the empire, culminated perhaps inevitably in mutual excommunications in 1054.
Communion with Constantinople was broken off by European Christians with the exception of those ruled by the empire (including the Bulgarians and Serbs) and of the fledgling Kievan or Russian Church, then a metropolitanate
A metropolis, metropolitanate or metropolitan diocese is an episcopal see whose bishop is the metropolitan bishop or archbishop of an ecclesiastical province. Metropolises, historically, have been important cities in their provinces.
Eastern Ortho ...
of the patriarchate of Constantinople. This church became independent only in 1448, just five years before the extinction of the empire, after which the Turkish authorities included all their Orthodox Christian subjects of whatever ethnicity in a single ''millet
Millets () are a highly varied group of small-seeded grasses, widely grown around the world as cereal crops or grains for fodder and human food. Most millets belong to the tribe Paniceae.
Millets are important crops in the Semi-arid climate, ...
'' headed by the Patriarch of Constantinople.
The Westerners who set up Crusader states
The Crusader states, or Outremer, were four Catholic polities established in the Levant region and southeastern Anatolia from 1098 to 1291. Following the principles of feudalism, the foundation for these polities was laid by the First Crusade ...
in Greece and the Middle East appointed Latin
Latin ( or ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally spoken by the Latins (Italic tribe), Latins in Latium (now known as Lazio), the lower Tiber area aroun ...
(Western) patriarchs and other hierarchs, thus giving concrete reality and permanence to the schism. Efforts were made in 1274 ( Second Council of Lyon) and 1439 ( Council of Florence) to restore communion between East and West, but the agreements reached by the participating eastern delegations and by the emperor were rejected by the vast majority of Byzantine Christians.
In the East, the idea that the Byzantine emperor was the head of Christians everywhere persisted among churchmen as long as the empire existed, even when its actual territory was reduced to very little. In 1393, only 60 years before the fall of the capital, Patriarch Antony IV of Constantinople wrote to Basil I of Muscovy defending the liturgical commemoration in Russian churches of the Byzantine emperor on the grounds that he was "emperor (βασιλεύς) and autokrator of the Romans, that is ''of all Christians''". According to Patriarch Antony, "it is not possible among Christians to have a Church and not to have an emperor. For the empire and the Church have great unity and commonality, and it is not possible to separate them", and "the holy emperor is not like the rulers and governors of other regions".[
]
Legacy
Following the schism between the Eastern and Western churches, various emperors sought at times but without success to reunite Christendom, invoking the notion of Christian unity between East and West in an attempt to obtain assistance from the pope and Western Europe against the Muslims who were gradually conquering the empire's territory. But the period of the Western Crusades
The Crusades were a series of religious wars initiated, supported, and at times directed by the Papacy during the Middle Ages. The most prominent of these were the campaigns to the Holy Land aimed at reclaiming Jerusalem and its surrounding t ...
against the Muslims had passed before even the first of the two reunion councils was held.
Even when persecuted by the emperor, the Eastern Church, George Pachymeres said, "counted the days until they should be rid not of their emperor (for they could no more live without an emperor than a body without a heart), but of their current misfortunes". The church had come to merge psychologically in the minds of the Eastern bishops with the empire to such an extent that they had difficulty in thinking of Christianity without an emperor.
In Western Europe, on the other hand, the idea of a universal church linked to the Emperor of Constantinople was replaced by that in which the Roman see was supreme. "Membership in a universal church replaced citizenship in a universal empire. Across Europe, from Italy to Ireland, a new society centered on Christianity was forming."
The Western Church
Western Christianity is one of two subdivisions of Christianity (Eastern Christianity being the other). Western Christianity is composed of the Latin Church and Western Protestantism, together with their offshoots such as the Old Catholic C ...
came to emphasize the term ''Catholic'' in its identity, an assertion of universality, while the Eastern Church came to emphasize the term ''Orthodox'' in its identity, an assertion of holding to the true teachings of Jesus. Both churches claim to be the unique continuation of the previously united state-sanctioned Chalcedonian and Nicene Church, whose core doctrinal formulations have been retained also by many of the churches that emerged from the Protestant Reformation
The Reformation, also known as the Protestant Reformation or the European Reformation, was a time of major theological movement in Western Christianity in 16th-century Europe that posed a religious and political challenge to the papacy and ...
, including Lutheranism
Lutheranism is a major branch of Protestantism that emerged under the work of Martin Luther, the 16th-century German friar and Protestant Reformers, reformer whose efforts to reform the theology and practices of the Catholic Church launched ...
and Anglicanism
Anglicanism, also known as Episcopalianism in some countries, is a Western Christianity, Western Christian tradition which developed from the practices, liturgy, and identity of the Church of England following the English Reformation, in the ...
.
See also
* Arian controversy
* Caesaropapism
* Chalcedonian Christianity
Chalcedonian Christianity is the branches of Christianity that accept and uphold theological resolutions of the Council of Chalcedon, the fourth ecumenical council, held in AD 451. Chalcedonian Christianity accepts the Christological Definiti ...
* Christian state
* Early Christianity
Early Christianity, otherwise called the Early Church or Paleo-Christianity, describes the History of Christianity, historical era of the Christianity, Christian religion up to the First Council of Nicaea in 325. Spread of Christianity, Christian ...
* History of the Eastern Orthodox Church
* History of Oriental Orthodoxy
Oriental Orthodoxy is the communion of Eastern Christianity, Eastern Christian Churches that recognize only three ecumenical councils—the First Council of Nicaea, the First Council of Constantinople and the Council of Ephesus. They reject the d ...
* History of Roman Catholicism
Notes
References
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{{DEFAULTSORT:State Church Of The Roman Empire
380s establishments in the Roman Empire
Christianity in late antiquity
Christianity in the Byzantine Empire
Christianity in the Roman Empire