Constantine the Great

Constantine the Great (27 February 272 – 22 May 337) was Roman Emperor from 306 to 337, the first to convert to Christianity, and the ruler whose policies transformed it from a legally precarious minority faith into the officially favored religion of the empire. Born Flavius Valerius Constantinus in Naissus (modern Niš, Serbia), Constantine was the son of the Emperor Constantius Chlorus and Helena — later Saint Helena. He served under Emperors Diocletian and Galerius in the eastern provinces before being recalled to Britannia in 305. When his father died the following year at York, the troops immediately acclaimed Constantine as Augustus. Years of civil war followed; he defeated Maxentius at the Battle of the Milvian Bridge outside Rome in 312 and, by 324, had overcome his last rival, Licinius, to rule the empire alone. Before Milvian Bridge, according to Eusebius of Caesarea and Lactantius — our earliest sources — Constantine received a vision of the Chi-Rho symbol with words interpreted as 'In this sign, conquer,' and ordered the monogram placed on his soldiers' shields. Constantine credited the victory to the Christian God, and this battle marks the beginning of his public favor toward the Church. In 313, Constantine and Licinius issued what historians call the Edict of Milan — a rescript granting legal toleration to Christianity and all other religions, ending state persecution, and ordering the return of confiscated Church property. Constantine went well beyond toleration: he funded the construction of major basilicas including Old St. Peter's in Rome and the Church of the Holy Sepulchre in Jerusalem, exempted clergy from taxation, and established Sunday as an official day of rest. In 325, he convened the First Council of Nicaea — the first ecumenical council in Christian history — to resolve the Arian controversy over the nature of Christ. The council produced the Nicene Creed, which remains the foundational statement of Christian orthodoxy across Catholic, Orthodox, and most Protestant traditions. Constantine's direct personal involvement in theology was real but complex: he was himself baptized at his deathbed in 337 by Eusebius of Nicomedia, an Arian bishop — a fact that has long complicated tidy accounts of his orthodoxy. In 330, Constantine formally inaugurated his rebuilt city of Byzantium on the Bosphorus, renamed New Rome — popularly known as Constantinople — as the new imperial capital. It served as the center of empire for over a thousand years. The Eastern Orthodox Church venerates Constantine as a saint with the title 'Equal to the Apostles.' The Western Church has historically acknowledged both his gifts to Christianity and the complications introduced when imperial power and ecclesiastical authority became so tightly bound together.