The Battle of Adrianople was fought on July 3, 324, during a Roman civil war, the second to be waged between the two emperors Constantine I and Licinius. Licinius was soundly defeated, his army suffering heavy casualties as a result. Constantine built up military momentum, winning further battles on land and sea, eventually leading to the final defeat of Licinius at Chrysopolis. In 326, Constantine became the sole emperor of the Roman Empire.