Constantine Defeats Licinius at the Battle of Adrianople
On July 3, 324, the Roman emperor Constantine I defeated his rival Licinius near Adrianople in Thrace, a decisive clash in the struggle for control of the empire. According to surviving sources, Constantine’s army broke Licinius’s lines after intense fighting, forcing him to retreat toward Byzantium. The victory cleared Constantine’s path to become sole emperor of a reunified Roman Empire. That political consolidation helped him push forward reforms, elevate Constantinople, and support Christianity’s growing public role in imperial life.