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Constantine I (27 February 27222 May
337 __NOTOC__ Year 337 (Roman numerals, CCCXXXVII) was a common year starting on Saturday of the Julian calendar. At the time, it was known as the Year of the Consulship of Felicianus and Titianus (or, less frequently, year 1090 ''Ab urbe condita ...
), also known as Constantine the Great, was a Roman emperor from AD  306 to 337 and the first Roman emperor to convert to
Christianity Christianity is an Abrahamic monotheistic religion, which states that Jesus in Christianity, Jesus is the Son of God (Christianity), Son of God and Resurrection of Jesus, rose from the dead after his Crucifixion of Jesus, crucifixion, whose ...
. He played a pivotal role in elevating the status of Christianity in Rome, decriminalising Christian practice and ceasing Christian persecution. This was a turning point in the Christianisation of the Roman Empire. He founded 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 ...
(modern-day
Istanbul Istanbul is the List of largest cities and towns in Turkey, largest city in Turkey, constituting the country's economic, cultural, and historical heart. With Demographics of Istanbul, a population over , it is home to 18% of the Demographics ...
) and made it the capital of the Empire, which it remained for over a millennium. Born in Naissus, a city located in the
province A province is an administrative division within a country or sovereign state, state. The term derives from the ancient Roman , which was the major territorial and administrative unit of the Roman Empire, Roman Empire's territorial possessions ou ...
of Moesia Superior (now
Niš Niš (; sr-Cyrl, Ниш, ; names of European cities in different languages (M–P)#N, names in other languages), less often spelled in English as Nish, is the list of cities in Serbia, third largest city in Serbia and the administrative cente ...
, Serbia), Constantine was the son of Flavius Constantius, a
Roman army The Roman army () served ancient Rome and the Roman people, enduring through the Roman Kingdom (753–509 BC), the Roman Republic (509–27 BC), and the Roman Empire (27 BC–AD 1453), including the Western Roman Empire (collapsed Fall of the W ...
officer from Moesia Superior, who would become one of the four emperors of the
Tetrarchy The Tetrarchy was the system instituted by Roman emperor Diocletian in 293 AD to govern the ancient Roman Empire by dividing it between two emperors, the ''augusti'', and their junior colleagues and designated successors, the ''caesares''. I ...
. His mother, Helena, was a woman of low birth, probably from
Bithynia Bithynia (; ) was an ancient region, kingdom and Roman province in the northwest of Asia Minor (present-day Turkey), adjoining the Sea of Marmara, the Bosporus, and the Black Sea. It bordered Mysia to the southwest, Paphlagonia to the northeast a ...
. Later canonised as a
saint In Christianity, Christian belief, a saint is a person who is recognized as having an exceptional degree of sanctification in Christianity, holiness, imitation of God, likeness, or closeness to God in Christianity, God. However, the use of the ...
, she is credited for the conversion of her son in some traditions, though others believe that Constantine converted her. Constantine was an Illyrian and part of the Illyrian Emperors that ruled the Roman Empire. He served with distinction under emperors
Diocletian Diocletian ( ; ; ; 242/245 – 311/312), nicknamed Jovius, was Roman emperor from 284 until his abdication in 305. He was born Diocles to a family of low status in the Roman province of Dalmatia (Roman province), Dalmatia. As with other Illyri ...
and
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 ...
. He began his career by campaigning in the eastern provinces against the
Persians Persians ( ), or the Persian people (), are an Iranian ethnic group from West Asia that came from an earlier group called the Proto-Iranians, which likely split from the Indo-Iranians in 1800 BCE from either Afghanistan or Central Asia. They ...
, before being recalled to the west in AD 305 to fight alongside his father in the province of
Britannia The image of Britannia () is the national personification of United Kingdom, Britain as a helmeted female warrior holding a trident and shield. An image first used by the Romans in classical antiquity, the Latin was the name variously appli ...
. After his father's death in 306, Constantine was proclaimed as ''
augustus Gaius Julius Caesar Augustus (born Gaius Octavius; 23 September 63 BC – 19 August AD 14), also known as Octavian (), was the founder of the Roman Empire, who reigned as the first Roman emperor from 27 BC until his death in A ...
'' (emperor) by his army at
Eboracum Eboracum () was a castra, fort and later a coloniae, city in the Roman province of Roman Britain, Britannia. In its prime it was the largest town in northern Britain and a provincial capital. The site remained occupied after the decline of the ...
(
York York is a cathedral city in North Yorkshire, England, with Roman Britain, Roman origins, sited at the confluence of the rivers River Ouse, Yorkshire, Ouse and River Foss, Foss. It has many historic buildings and other structures, such as a Yor ...
, England). He eventually emerged victorious in the civil wars against the emperors
Maxentius Marcus Aurelius Valerius Maxentius ( 283 – 28 October 312) was a Roman emperor from 306 until his death in 312. Despite ruling in Italy and North Africa, and having the recognition of the Senate in Rome, he was not recognized as a legitimate ...
and
Licinius Valerius Licinianus Licinius (; Ancient Greek, Greek: Λικίνιος; c. 265 – 325) was Roman emperor from 308 to 324. For most of his reign, he was the colleague and rival of Constantine I, with whom he co-authored the Edict of Milan that ...
to become the sole ruler 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 ...
by 324. Upon his ascension, Constantine enacted numerous reforms to strengthen the empire. He restructured the government, separating civil and military authorities. To combat inflation, he introduced the solidus, a new gold coin that became the standard for Byzantine and European currencies for more than a thousand years. The
Roman army The Roman army () served ancient Rome and the Roman people, enduring through the Roman Kingdom (753–509 BC), the Roman Republic (509–27 BC), and the Roman Empire (27 BC–AD 1453), including the Western Roman Empire (collapsed Fall of the W ...
was reorganised to consist of mobile units (), often around the emperor. This was done to serve in campaigns against external enemies or Roman rebels, and frontier-garrison troops. () These troops were capable of countering barbarian raids, but less and less capable, over time, of countering full-scale
barbarian invasions The Migration Period ( 300 to 600 AD), also known as the Barbarian Invasions, was a period in European history marked by large-scale migrations that saw the fall of the Western Roman Empire and subsequent settlement of its former territories ...
. Constantine pursued successful campaigns against the tribes on the
Roman frontiers Roman or Romans most often refers to: *Rome, the capital city of Italy *Ancient Rome, Roman civilization from 8th century BC to 5th century AD *Roman people, the people of Roman civilization *Epistle to the Romans, shortened to Romans, a letter w ...
—such as 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 ...
, the
Alemanni The Alemanni or Alamanni were a confederation of Germanic peoples, Germanic tribes * * * on the Upper Rhine River during the first millennium. First mentioned by Cassius Dio in the context of the campaign of Roman emperor Caracalla of 213 CE ...
, 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 the
Sarmatians The Sarmatians (; ; Latin: ) were a large confederation of Ancient Iranian peoples, ancient Iranian Eurasian nomads, equestrian nomadic peoples who dominated the Pontic–Caspian steppe, Pontic steppe from about the 5th century BCE to the 4t ...
—and resettled territories abandoned by his predecessors during the
Crisis of the Third Century The Crisis of the Third Century, also known as the Military Anarchy or the Imperial Crisis, was a period in History of Rome, Roman history during which the Roman Empire nearly collapsed under the combined pressure of repeated Barbarian invasions ...
with citizens of Roman culture. Although Constantine lived much of his life as a
pagan 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 ...
and later as a catechumen, he began to favour Christianity beginning in
312 __NOTOC__ Year 312 (Roman numerals, CCCXII) was a leap year starting on Tuesday of the Julian calendar. In the Roman Empire, it was known as the Year of the Consulship of Constantinus and Licinianus (or, less frequently, year 1065 ''Ab urbe co ...
, finally becoming a Christian and being baptised by Eusebius of Nicomedia, an
Arian Arianism (, ) is a 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 considered he ...
bishop, although 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 ...
and the
Coptic Orthodox Church The Coptic Orthodox Church (), also known as the Coptic Orthodox Patriarchate of Alexandria, is an Oriental Orthodox Christian church based in Egypt. The head of the church and the See of Alexandria is the pope of Alexandria on the Holy Apo ...
maintain that he was baptised by Pope Sylvester I. He played an influential role in the proclamation of 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 ...
in 313, which declared tolerance for Christianity in the Roman Empire. He convoked 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 which produced the statement of Christian belief known as the
Nicene Creed The Nicene Creed, also called the Creed of Constantinople, is the defining statement of belief of Nicene Christianity and in those Christian denominations that adhere to it. The original Nicene Creed was first adopted at the First Council of N ...
. On his orders, the
Church of the Holy Sepulchre The Church of the Holy Sepulchre, also known as the Church of the Resurrection, is a fourth-century church in the Christian Quarter of the Old City of Jerusalem, Old City of Jerusalem. The church is the seat of the Greek Orthodox Patriarchat ...
was built at the site claimed to be the tomb of Jesus in
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 ...
, and was deemed the holiest place in all of
Christendom The terms Christendom or Christian world commonly refer to the global Christian community, Christian states, Christian-majority countries or countries in which Christianity is dominant or prevails.SeMerriam-Webster.com : dictionary, "Christen ...
. The papal claim to temporal power in the
High Middle Ages The High Middle Ages, or High Medieval Period, was the periodization, period of European history between and ; it was preceded by the Early Middle Ages and followed by the Late Middle Ages, which ended according to historiographical convention ...
was based on the fabricated Donation of Constantine. He has historically been referred to as the "First Christian Emperor", but while he did favour the Christian Church, some modern scholars debate his beliefs and even his comprehension of Christianity. Nevertheless, he is venerated as a saint in
Eastern Christianity Eastern Christianity comprises Christianity, Christian traditions and Christian denomination, church families that originally developed during Classical antiquity, classical and late antiquity in the Eastern Mediterranean region or locations fu ...
, and he did much to push Christianity towards the mainstream of Roman culture. The age of Constantine marked a distinct epoch in the history of the Roman Empire and a pivotal moment in the transition from
classical antiquity Classical antiquity, also known as the classical era, classical period, classical age, or simply antiquity, is the period of cultural History of Europe, European history between the 8th century BC and the 5th century AD comprising the inter ...
to the
Middle Ages In the history of Europe, the Middle Ages or medieval period lasted approximately from the 5th to the late 15th centuries, similarly to the post-classical period of global history. It began with the fall of the Western Roman Empire and ...
. He built a new imperial residence in the city of
Byzantium Byzantium () or Byzantion () was an ancient Greek city in classical antiquity that became known as Constantinople in late antiquity and Istanbul today. The Greek name ''Byzantion'' and its Latinization ''Byzantium'' continued to be used as a n ...
, which was officially renamed ''
New Rome New Rome (, ''Néa Rhṓmē''; ; ; ) was the original name given by the Roman emperor Constantine the Great to his new imperial capital in 330 CE, which was built as an expansion of the city of Byzantium on the European coast of the Bosporus s ...
'', while also taking on the name ''
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 ...
'' in his honour. It subsequently served as the capital of the empire for more than a thousand years—with the Eastern Roman Empire for most of that period commonly referred to retrospectively as 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 ...
'' in English. In leaving the empire to his sons and other members of the
Constantinian dynasty The Constantinian dynasty is an informal name for the ruling family of the Roman Empire from Constantius Chlorus (died 306) to the death of Julian in 363. It is named after its most famous member, Constantine the Great, who became the sole rule ...
, Constantine's immediate political legacy was the effective replacement of Diocletian's Tetrarchy with the principle of dynastic succession. His memory was held in high regard during the lifetime of his children and for centuries after his reign. The medieval church held him up as a paragon of virtue, while secular rulers invoked him as a symbol of imperial legitimacy. The rediscovery of anti-Constantinian sources in the early
Renaissance The Renaissance ( , ) is a Periodization, period of history and a European cultural movement covering the 15th and 16th centuries. It marked the transition from the Middle Ages to modernity and was characterized by an effort to revive and sur ...
engendered more critical appraisals of his reign, with modern and contemporary scholarship often seeking to balance the extremes of earlier accounts.


Sources

Constantine was a ruler of major importance and has always been a controversial figure. The fluctuations in his reputation reflect the nature of the ancient sources for his reign. These are abundant and detailed, but they have been strongly influenced by the official propaganda of the period and are often one-sided. No contemporaneous histories or biographies dealing with his life and rule have survived; the nearest alternative is
Eusebius Eusebius of Caesarea (30 May AD 339), also known as Eusebius Pamphilius, was a historian of Christianity, exegete, and Christian polemicist from the Roman province of Syria Palaestina. In about AD 314 he became the bishop of Caesarea Maritima. ...
's '' Vita Constantini'', which offers a mixture of eulogy and
hagiography A hagiography (; ) is a biography of a saint or an ecclesiastical leader, as well as, by extension, an adulatory and idealized biography of a preacher, priest, founder, saint, monk, nun or icon in any of the world's religions. Early Christian ...
written between 335 and 339 to extol Constantine's moral and religious virtues. The ''Vita'' creates a contentiously positive image of Constantine, and modern historians have frequently challenged its reliability. The fullest secular life of Constantine is the anonymous '' Origo Constantini'', a work of uncertain date which focuses on military and political events to the neglect of cultural and religious matters.
Lactantius Lucius Caecilius Firmianus Lactantius () was an early Christian author who became an advisor to Roman emperor Constantine I, guiding his Christian religious policy in its initial stages of emergence, and a tutor to his son Crispus. His most impo ...
' '' De mortibus persecutorum'', a political Christian pamphlet on the reigns of
Diocletian Diocletian ( ; ; ; 242/245 – 311/312), nicknamed Jovius, was Roman emperor from 284 until his abdication in 305. He was born Diocles to a family of low status in the Roman province of Dalmatia (Roman province), Dalmatia. As with other Illyri ...
and the
Tetrarchy The Tetrarchy was the system instituted by Roman emperor Diocletian in 293 AD to govern the ancient Roman Empire by dividing it between two emperors, the ''augusti'', and their junior colleagues and designated successors, the ''caesares''. I ...
, provides valuable but tendentious detail on Constantine's predecessors and early life. The
ecclesiastical {{Short pages monitor


Modern sources

* * * * * * * * * * * * * * * * Paperback * * * * * * * * * * * * * * * * * * * * * * * * * * * *David Mattingly (author), Mattingly, David. ''An Imperial Possession: Britain in the Roman Empire''. London: Penguin, 2007. * * * * * * * Paperback * * Paperback * * *Scheidel, Walter. "The Monetary Systems of the Han and Roman Empires". In Scheidel, ed., ''Rome and China: Comparative Perspectives on Ancient World Empires''. Oxford: Oxford University Press, 2010, * * * * *Udoh, Fabian E. "Quand notre monde est devenu chretien", review, ''Theological Studies'', June 2008 *Paul Veyne, Veyne, Paul. ''L'Empire Gréco-Romain'', Paris: Seuil, 2005. *Paul Veyne, Veyne, Paul.''Quand notre monde est devenu chrétien'', Paris: Albin Michel, 2007. * * * * *Wienand, Johannes (ed.). ''Contested Monarchy. Integrating the Roman Empire in the Fourth Century AD''. Oxford: Oxford University Press 2015. * * * * *


Further reading

*Arjava, Antii. ''Women and Law in Late Antiquity''. Oxford: Oxford University Press, 1996. * Alessandro Barbero, Barbero, Alessandro (2016). ''Costantino il vincitore'' [Constantine the victor]. Rome: Salerno, . * * * *Cowan, Ross (2016).
Milvian Bridge AD 312: Constantine's Battle for Empire and Faith
'. Oxford: Osprey Publishing. * Alexander Demandt, Demandt, Alexander; Engemann, Josef (eds) (2006). ''Konstantin der Große. Geschichte – Archäologie – Rezeption'' [Constantine the Great. History - Archaeology - Reception]. Trier: Rheinisches Landesmuseum, . * Doležal, Stanislav (2022). ''The Reign of Constantine, 306–337: Continuity and Change in the Late Roman Empire.'' Cham: Palgrave Macmillan. * *Fourlas, Benjamin (2020). "St Constantine and the Army of Heroic Men Raised by Tiberius II Constantine in 574/575. Some Thoughts on the Historical Significance of the Early Byzantine Silver Hoard at Karlsruhe". ''Jahrbuch des Römisch-Germanischen Zentralmuseums'' 62, 2015 [published 2020], 341–375. * Girardet, Klaus Martin (2010). ''Der Kaiser und sein Gott. Das Christentum im Denken und in der Religionspolitik Konstantins des Großen'' [The Emperor and his God. Christianity in the Thought and Religious Policy of Constantine the Great]. Berlin/New York: De Gruyter, . * Goltz, Andreas; Schlange-Schöningen, Heinrich (eds) (2008). ''Konstantin der Große. Das Bild des Kaisers im Wandel der Zeiten'' [Constantine the Great. The image of the emperor through the ages]. Köln: Böhlau, . *Harries, Jill. ''Law and Empire in Late Antiquity''. Cambridge, UK: Cambridge University Press, 2004. Hardcover Paperback *Hartley, Elizabeth. ''Constantine the Great: York's Roman Emperor''. York: Lund Humphries, 2004. . *Heather, Peter J. "''Foedera'' and ''Foederati'' of the Fourth Century." In ''From Roman Provinces to Medieval Kingdoms'', edited by Thomas F.X. Noble, 292–308. New York: Routledge, 2006. Hardcover Paperback *Leithart, Peter J. Defending Constantine: The Twilight of an Empire and the Dawn of Christendom. Downers Grove: IL, InterVarsity Press 2010 *MacMullen, Ramsay. ''Christianizing the Roman Empire A.D. 100–400''. New Haven, CT; London: Yale University Press, 1984. *MacMullen, Ramsay. ''Christianity and Paganism in the Fourth to Eighth Centuries''. New Haven: Yale University Press, 1997. *Percival J
On the Question of Constantine's Conversion to Christianity
, Clio History Journal, 2008 * *Velikov, Yuliyan (2013). ''Imperator et Sacerdos''. Veliko Turnovo University Press. (in Bulgarian)


External links


Complete chronological list of Constantine's extant writings
(archived 19 February 2013) * *Letters of Constantine


Encyclopædia Britannica, Constantine I
*Henry Stuart Jones (1911). "wikisource:1911 Encyclopædia Britannica/Constantine (emperors), Constantine (emperors)". In Chisholm, Hugh (ed.). ''Encyclopædia Britannica''. 6. (11th ed.), Cambridge University Press. pp. 988–992. *Charles George Herbermann and Georg Grupp (1908). "wikisource:Catholic Encyclopedia (1913)/Constantine the Great, Constantine the Great". In ''Catholic Encyclopedia''. 4. New York: Robert Appleton Company.
BBC North Yorkshire's site on Constantine the GreatConstantine's time in York on the 'History of York'CommemorationsRoman Legionary AD 284–337: The Age of Diocletian and Constantine the GreatMilvian Bridge AD 312: Constantine's Battle for Empire and Faith
{{DEFAULTSORT:Constantine 01 Constantine the Great, 272 births 337 deaths 3rd-century births 4th-century Christian saints 4th-century Roman consuls 4th-century Roman emperors Ancient Romans in Britain Angelic visionaries Burials at the Church of the Holy Apostles Byzantine royal saints City founders Constantinian dynasty Converts to Christianity from ancient Roman religions Deified Roman emperors Filicides Flavii Gothicus Maximus Illyrian emperors Illyrian people Participants in the First Council of Nicaea People from Niš Sons of Roman emperors Tetrarchy Valerii Eastern Orthodox saints