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Events

By Place

Roman Empire

• July 3 — Battle of Adrianople: Constantine I defeats Licinius, forcing him to retreat to Byzantium.
• July — Battle of Hellespont: Crispus, defeats Licinius' naval fleet, allowing his father Constantine the ability to cross over the Bosporus into Licinius' Asian provinces.
• September 18 — Constantine definitively defeats Licinius at the Battle of Chrysopolis, and becomes sole emperor, thus ending the Tetrarchy.
• December 19 — Licinius abdicates his position as Emperor.

Religion

• St Peter's Church is founded in Rome.
• Eustathius becomes bishop of Antioch.

Births

• Empress Chu Suanzi

Deaths

• December 20 — Philogonus, Patriarch of Antioch
• Guo Pu
• Wang Dun
• Zhang Mao