A marble head of the emperor Licinius, found at Ephesus, in the Kunsthistorisches Museum, ViennaImage: unknown, found in Ephesos · CC BY-SA 4.0Constantine defeats Licinius at Adrianople
By 324 the Roman world was split between two emperors, Constantine in the west and his brother-in-law Licinius in the east, and their uneasy alliance had broken down. On 3 July 324 Constantine’s army crossed the River Hebrus by surprise near Adrianople, in Thrace, and routed Licinius’s larger force. Licinius fled to Byzantium and was finally beaten at Chrysopolis in September. Constantine became sole emperor, and he later rebuilt Byzantium as his new capital, Constantinople.
Source: De Imperatoribus Romanis: Licinius ↗
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