The Battle of Adrianople is fought in Thrace on this date in 324 AD, between the armies of two emperors Constantine I and Licinius during the Tetrarchy Civil Wars. While Licinus was defeated, Constantine had the momentum, winning further battles.

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Constantine would soon lay siege to Byzantium, as both emperors fought for control of the narrow waters separating Thrace and Asia Minor. His son Crispus pulled off a naval victory over Licinius much larger fleet at the Battle of Hellespont, as Constantine crossed into Bithynia and defeared Licinius at Chrysopolis, that would see the end of Tetrarchy. He became the first man to be master of entire Roman world since Maximian was elevated as co-emperor by Diocletian in 286.