Constantine the Great (272 – 22 May 337) was Roman emperor from 324 to 337. He rose from the ranks of the army as the son of the western Caesar Constantius Chlorus, fought a series of civil wars against rival claimants such as Maxentius and Licinius, and after his victory at the Battle of the Milvian Bridge (312) became sole ruler of the Roman Empire. Constantine is remembered for his conversion to Christianity (traditionally dated to 312), his patronage and legal promotion of the Christian Church (including the First Council of Nicaea in 325), his founding and renovation of the new eastern capital Constantinople (formerly Byzantium), and for broad administrative, military and fiscal reforms that reshaped the later Roman state. He died in 337 and was succeeded by his sons, beginning with Constantine II.
Biography[]
Early life[]
Flavius Valerius Aurelius Constantinus was born in about 272 in Naissus in the province of Dacia Mediterranea, the son of the general Constantius Chlorus and his (possibly lower–status) consort Flavia Julia Helena. As a youth he was sent east by his father and received military and court training at the imperial courts of Diocletian and Galerius, where he served as a junior officer and gained experience on the Roman frontiers, including campaigns against the Sassanid Empire.
When the tetrarchic arrangements changed in 305, his father became one of the Augusti but died in 306 while on campaign in Britain. Constantine’s troops proclaimed him emperor (imperator) at Eboracum (York) soon after his father’s death; his accession set him on a collision course with other claimants in the fractured tetrarchic system.
Rise to power[]
In the years that followed Constantine fought a succession of civil wars against rival emperors and usurpers. He consolidated his position in the West by defeating Maxentius at the Battle of the Milvian Bridge outside Rome in 312 — an event that later sources link with Constantine having experienced a portent (a cross or sign in the sky) and converting to Christianity. He then turned east and defeated his remaining rival, Licinius, at Chrysopolis in 324, thereby becoming sole emperor of both eastern and western halves of the Roman world.
As emperor (324–337)[]
Upon securing sole rule, Constantine instituted wide-ranging reforms across the empire. He reorganised the army and its command, reformed the imperial administration and finances, and continued the trend of increasing centralisation and separation between civil and military offices. He fortified frontiers, campaigned intermittently against external foes, and managed dynastic arrangements to secure succession for his sons.
Religious policy and Christianity[]
Constantine’s reign marks a turning point in the history of Christianity. In 313 he and Licinius issued (or endorsed) measures of tolerance toward Christians often summarised under the term the Edict of Milan, ending persecutions and restoring confiscated Christian property. Constantine actively patronised the Church: he funded basilicas and pilgrim sites, endowed clergy, intervened in theological disputes, and presided over or called the First Council of Nicaea in 325, which produced the original form of the Nicene Creed and addressed the Arian controversy. While Constantine’s personal theology and the timing and nature of his conversion remain debated among historians, his reign unquestionably advanced Christianity’s public position and institutional development within the empire.
Administrative, monetary and legal reforms[]
Constantine continued the administrative evolution begun under the tetrarchy. He increased the separation between civil and military authority, reorganised provincial structures in some regions, and expanded the imperial bureaucracy. He introduced monetary reforms, replacing the debased coinage of the late third century with a new gold standard (the solidus) that provided long-lasting fiscal stability. Legal changes under his reign reflect both pragmatic governance and Christian-influenced attitudes toward issues such as manumission, marriage and welfare.
Urban and building programs; Constantinople[]
Constantine invested heavily in monumental building. He restored and built churches (most famously beginning work on the Church of the Holy Sepulchre in Jerusalem), basilicas, baths and civic monuments across the empire. In 330 he dedicated his new capital at the site of Byzantium, renaming it Constantinople — a purposefully imperial city laid out with monumental architecture, which would remain a political, economic and religious centre for more than a millennium.
Personal life[]
Constantine married at least twice; his better-documented marriage was to Fausta, daughter of the Emperor Maximian, by whom he had several children, including his sons Crispus (from an earlier union or concubinage) and the later emperors Constantine II, Constantius II and Constans. The emperor’s family life was a mixture of dynastic calculation and private tragedy: Crispus was executed in 326 under circumstances that remain contentious, and Fausta died shortly afterwards; later sources link palace intrigue and rivalry among imperial kin to these events.
Death and succession[]
Constantine fell ill and died on 22 May 337. In the months immediately after his death his surviving sons were proclaimed emperors and the empire was divided among them. Constantine’s burial was the subject of imperial ceremony; he was venerated by some contemporaries and later remembered by both Christian and pagan authors with competing emphases on his piety, politics and power.
Legacy[]
Constantine’s reign transformed the Roman Empire. By elevating Christianity’s legal and institutional status, founding a new imperial capital in the East, stabilising the currency with the solidus, and reshaping imperial administration and military structures, he left a durable imprint on Late Antiquity. His life and actions have been variously interpreted across later Christian, Byzantine and Western traditions: as the Christian emperor who protected the Church; as a pragmatist who used religion for political consolidation; and as the founder of a new Eastern Rome that would endure into the medieval age.
Gallery[]
| Roman Emperor | ||
|---|---|---|
| Preceded by: Licinius |
324 – 337 AD | Succeeded by: Constantine II |