Leo III the Isaurian ( gr, Λέων ὁ Ἴσαυρος, Leōn ho Isauros; la, Leo Isaurus; 685 – 18 June 741), also known as the Syrian, was
Byzantine Emperor
This is a list of the Byzantine emperors from the foundation of Constantinople in 330 AD, which marks the conventional start of the Eastern Roman Empire, to its fall to the Ottoman Empire in 1453 AD. Only the emperors who were recognized as l ...
from 717 until his death in 741 and founder of the
Isaurian dynasty. He put an end to the
Twenty Years' Anarchy, a period of great instability in the Byzantine Empire between 695 and 717, marked by the rapid succession of several emperors to the throne. He also successfully defended the Empire against the invading
Umayyads and
forbade the veneration of icons.
Early life
Of Syrian extraction, Leo was born in
Germanikeia,
Commagene
Commagene ( grc-gre, Κομμαγηνή) was an ancient Greco-Iranian kingdom ruled by a Hellenized branch of the Iranian Orontid dynasty that had ruled over Armenia. The kingdom was located in and around the ancient city of Samosata, which ...
(modern
Kahramanmaraş
Marash (Armenian: Մարաշ), officially Kahramanmaraş () and historically Germanicea (Greek: Γερμανίκεια), is a city in the Mediterranean Region of Turkey and the administrative center of Kahramanmaraş Province. Before 1973, Kahra ...
in Turkey). His original name was Konon ( gr, Κόνων; la, Conon or ''Cononus''). Some, including the
Byzantine
The Byzantine Empire, also referred to as the Eastern Roman Empire or Byzantium, was the continuation of the Roman Empire primarily in its eastern provinces during Late Antiquity and the Middle Ages, when its capital city was Constantin ...
chronicler
Theophanes, have claimed that Konon's family had been resettled in
Thrace
Thrace (; el, Θράκη, Thráki; bg, Тракия, Trakiya; tr, Trakya) or Thrake is a geographical and historical region in Southeast Europe, now split among Bulgaria, Greece, and Turkey, which is bounded by the Balkan Mountains to ...
, where he entered the service of Emperor
Justinian II, when the latter was advancing on
Constantinople
la, Constantinopolis ota, قسطنطينيه
, alternate_name = Byzantion (earlier Greek name), Nova Roma ("New Rome"), Miklagard/Miklagarth ( Old Norse), Tsargrad ( Slavic), Qustantiniya (Arabic), Basileuousa ("Queen of Cities"), Megalopolis ( ...
with an army of loyalist followers, and horsemen provided by
Tervel of Bulgaria in 705. Leo was likely to have been a
Jacobite
Jacobite means follower of Jacob or James. Jacobite may refer to:
Religion
* Jacobites, followers of Saint Jacob Baradaeus (died 578). Churches in the Jacobite tradition and sometimes called Jacobite include:
** Syriac Orthodox Church, sometimes ...
Christian, but would have converted to the Chalcedonian creed upon joining the Byzantine hierarchy. Leo was fluent in Arabic, possibly as a native language, and was described by
Theophanes as "the Saracen minded."
After the victory of Justinian II, Konon was dispatched on a diplomatic mission to
Alania and
Lazica to organize an alliance against the
Umayyad Caliph
A caliphate or khilāfah ( ar, خِلَافَة, ) is an institution or public office under the leadership of an Islamic steward with the title of caliph (; ar, خَلِيفَة , ), a person considered a political-religious successor to th ...
ate under
Al-Walid I
Al-Walid ibn Abd al-Malik ibn Marwan ( ar, الوليد بن عبد الملك بن مروان, al-Walīd ibn ʿAbd al-Malik ibn Marwān; ), commonly known as al-Walid I ( ar, الوليد الأول), was the sixth Umayyad caliph, ruling from ...
. According to the Chronicle of Theophanes Justinian wanted to get rid of Konon and took back the money that had been given to him to help advance Byzantine interests, thus leaving Konon stranded in Alania. The chronicle describes the mission as successful and Konon returning eventually to Justinian after crossing the Caucasus mountains in May with
snowshoes and taking the fortress of Sideron (associated with
Tsebelda) on the way.
Konon was appointed commander (
''stratēgos'') of the
Anatolic Theme by Emperor
Anastasius II. On his deposition, Konon joined with his colleague
Artabasdus
Artavasdos or Artabasdos ( el, or , from Armenian: Արտավազդ, ''Artavazd'', ''Ardavazt''), Latinized as Artabasdus, was a Byzantine general of Armenian descent who seized the throne from June 741 or 742 until November 743, in usurpation ...
, the ''stratēgos'' of the
Armeniac Theme, in conspiring to overthrow the new Emperor Theodosius III. Artabasdus was betrothed to
Anna,
daughter of Leo as part of the agreement.
Siege of Constantinople
Leo entered Constantinople on 25 March 717 and forced the abdication of Theodosius III, becoming emperor as Leo III. The new emperor was immediately forced to attend to the
Second Arab siege of Constantinople, which commenced in August of the same year. The Arabs were Umayyad forces sent by Caliph
Sulayman ibn Abd al-Malik and serving under his brother
Maslama ibn Abd al-Malik. They had taken advantage of the civil discord in the Byzantine Empire to bring a force of 80,000 to 150,000 men and a massive fleet to the
Bosphorus
The Bosporus Strait (; grc, Βόσπορος ; tr, İstanbul Boğazı 'Istanbul strait', colloquially ''Boğaz'') or Bosphorus Strait is a natural strait and an internationally significant waterway located in Istanbul in northwestern Tu ...
.
Careful preparations, begun three years earlier under Anastasius II, and the stubborn resistance put up by Leo wore out the invaders. An important factor in the victory of the Byzantines was their use of
Greek fire. The Arab forces also fell victim to Bulgarian reinforcements arriving to aid the Byzantines. Leo was allied with the Bulgarians but the chronicler
Theophanes the Confessor
Theophanes the Confessor ( el, Θεοφάνης Ὁμολογητής; c. 758/760 – 12 March 817/818) was a member of the Byzantine aristocracy who became a monk and chronicler. He served in the court of Emperor Leo IV the Khazar before takin ...
was uncertain if they were still serving under
Tervel of Bulgaria or his eventual successor
Kormesiy of Bulgaria.
Unable to continue the siege in the face of the Bulgarian onslaught, the impenetrability of Constantinople's walls, and their own exhausted provisions, the Arabs were forced to abandon the siege in August 718. Sulayman himself had died the previous year and his successor
Umar II would not attempt another siege. The siege had lasted 12 months.
Administration

Having thus saved the Empire from extinction, Leo proceeded to consolidate its administration, which in the previous years of anarchy had become completely disorganized. In 718 he suppressed a rebellion in
Sicily
(man) it, Siciliana (woman)
, population_note =
, population_blank1_title =
, population_blank1 =
, demographics_type1 = Ethnicity
, demographics1_footnotes =
, demographi ...
; the following year saw the deposed Emperor
Anastasios II raise an army and attempt to retake the throne, but he was captured and executed by Leo's government.
Leo secured the Empire's frontiers by inviting
Slavic settlers into the depopulated districts and by restoring the
army
An army (from Old French ''armee'', itself derived from the Latin verb ''armāre'', meaning "to arm", and related to the Latin noun ''arma'', meaning "arms" or "weapons"), ground force or land force is a fighting force that fights primarily on ...
to efficiency; when the Umayyad Caliphate renewed its invasions in 726 and 739, as part of the campaigns of
Hisham ibn Abd al-Malik, the Arab forces were decisively beaten, particularly at
Akroinon in 740. His military efforts were supplemented by his alliances with the
Khazars and the
Georgians.
Leo undertook a set of civil reforms including the abolition of the system of prepaying taxes which had weighed heavily upon the wealthier proprietors, the elevation of the
serfs into a
class of free
tenants and the remodelling of
Family law
Family law (also called matrimonial law or the law of domestic relations) is an area of the law that deals with family matters and domestic relations.
Overview
Subjects that commonly fall under a nation's body of family law include:
* Marri ...
,
maritime law and
criminal law, notably substituting
mutilation for the
death penalty in many cases. The new measures, which were embodied in a new
code called the ''
Ecloga'' (''Selection''), published in 726, met with some opposition on the part of the nobles and higher clergy. The Emperor also undertook some reorganization of the
theme structure by creating new themata in the
Aegean region.
Iconoclasm

Leo's most striking legislative reforms dealt with religious matters, especially
iconoclasm
Iconoclasm (from Ancient Greek, Greek: grc, wikt:εἰκών, εἰκών, lit=figure, icon, translit=eikṓn, label=none + grc, wikt:κλάω, κλάω, lit=to break, translit=kláō, label=none)From grc, wikt:εἰκών, εἰκών + wi ...
("icon-breaking," therefore an iconoclast is an "icon-breaker"). After an apparently successful attempt to enforce the
baptism
Baptism (from grc-x-koine, βάπτισμα, váptisma) is a form of ritual purification—a characteristic of many religions throughout time and geography. In Christianity, it is a Christian sacrament of initiation and adoption, almost inv ...
of all
Jews and
Montanists
Montanism (), known by its adherents as the New Prophecy, was an History of Christianity#Early Christianity (c. 31/33–324), early Christian movement of the Christianity in the 2nd century, late 2nd century, later referred to by the name of it ...
in the empire (722), he issued a
series of edicts against the veneration of images (726–729).
A revolt which broke out in Greece, mainly on religious grounds, was crushed by the imperial fleet in 727 (cf.
Agallianos Kontoskeles). In 730,
Patriarch Germanos I of Constantinople resigned rather than subscribe to an iconoclastic decree. Leo had him replaced by
Anastasios, who willingly sided with the Emperor on the question of icons. Thus Leo suppressed the overt opposition of the capital.
In the
Italian Peninsula, the defiant attitude of Popes
Gregory II and later
Gregory III on behalf of image-veneration led to a fierce quarrel with the Emperor. The former summoned councils in
Rome
, established_title = Founded
, established_date = 753 BC
, founder = King Romulus ( legendary)
, image_map = Map of comune of Rome (metropolitan city of Capital Rome, region Lazio, Italy).svg
, map_caption ...
to anathematize and excommunicate the iconoclasts (730, 732); in 740 Leo retaliated by transferring
Southern Italy and
Illyricum from the papal diocese to that of the
patriarch of Constantinople. The struggle was accompanied by an armed outbreak in the
exarchate of Ravenna
The Exarchate of Ravenna ( la, Exarchatus Ravennatis; el, Εξαρχάτο της Ραβέννας) or of Italy was a lordship of the Eastern Roman Empire (Byzantine Empire) in Italy, from 584 to 751, when the last exarch was put to death by the ...
in 727, which Leo finally endeavoured to subdue by means of a large fleet. But the destruction of the armament by a storm decided the issue against him; his southern Italian subjects successfully defied his religious edicts, and the
Exarchate of Ravenna
The Exarchate of Ravenna ( la, Exarchatus Ravennatis; el, Εξαρχάτο της Ραβέννας) or of Italy was a lordship of the Eastern Roman Empire (Byzantine Empire) in Italy, from 584 to 751, when the last exarch was put to death by the ...
became effectively detached from the Empire.
Scholars have discussed the mutual influence of Muslim and Byzantine iconoclasm, noting that
Caliph
A caliphate or khilāfah ( ar, خِلَافَة, ) is an institution or public office under the leadership of an Islamic steward with the title of caliph (; ar, خَلِيفَة , ), a person considered a political-religious successor to th ...
Yazid II had issued an iconoclastic edict, also targeting his Christian subjects, already in 721.
Death and family

Leo III died of
dropsy on 18 June 741 and was buried in the
Church of the Holy Apostles.
With his wife
Maria, Leo III had four known children:
*
Constantine V, born in 718. He was crowned co-emperor in 720 and became senior emperor in 741.
*
Anna, born before 705. She married the future emperor
Artabasdos.
*Kosmo and Irene. They were both buried in a sarcophagus of Proconnesian marble in the Church of the Apostles.
[Lilie, Ralph-Johannes ''et al.'' (2013).]
Kosmo (#4148)
. ''PmbZ''
See also
*
List of Byzantine emperors
This is a list of the Byzantine emperors from the foundation of Constantinople in 330 AD, which marks the conventional start of the Byzantine Empire, Eastern Roman Empire, to Fall of Constantinople, its fall to the Ottoman Empire in 1453 AD. On ...
Citations
General and cited references
*
Entry of Leo IIIin ''The
Oxford Dictionary of Byzantium'', ed.
Alexander Kazhdan. New York: Oxford University Press, 1991.
External links
{{DEFAULTSORT:Leo 03
685 births
710s in the Byzantine Empire
720s in the Byzantine Empire
730s in the Byzantine Empire
740s in the Byzantine Empire
741 deaths
8th-century Byzantine emperors
Byzantine Iconoclasm
Byzantine people of the Arab–Byzantine wars
Deaths from edema
Governors of the Anatolic Theme
Isaurian dynasty
Medieval legislators
People from Kahramanmaraş