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September 9 - Constantine II, Constantius II, and Constans succeed their father Constantine I and rule as co-emperors of the Roman Empire.
September - A number of descendants of Constantius Chlorus, as well as officials of the Roman Empire, are executed. Responsibility for this purge is denied by the three Augusti.
Shapur II of Persia begins a war with the Roman Empire.

May 22 - Constantine I, Roman Emperor
September - Hannibalianus, King of the Pontus and nephew of Constantine I (executed)
September - Dalmatius, Caesar and nephew of Constantine I (executed)
September - Flavius Dalmatius, son of Constantius Chlorus and father of Hannibalianus and Dalmatius (executed)
September - Julius Constantius, son of Constantius Chlorus and father of Gallus and Julian (executed)
September - Patricius Optatus (executed)
September - Ablavius, Prefect of the Imperial Guard (executed)
Eustathius, Patriarch of Antioch (probable date)
Alexander, Patriarch of Constantinople

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