337

Roman Empire

 * —, , and succeed their father  and rule as co-emperors of the Roman Empire.  The  ends.
 * September — A number of descendants of, as well as officials of the Roman Empire, are executed. Responsibility for this is denied by the three.
 * of Persia begins a war with the Roman Empire.

Religion

 * — succeeds  as the 35th.
 * — Constantius II announces the restoration of as.
 * becomes.

Births

 * ,  monk and traveler (approximate date)

Deaths

 * —, Roman Emperor
 * September —, King of the Pontus and nephew of Constantine I (executed)
 * September —, and nephew of Constantine I (executed)
 * September —, son of Constantius Chlorus and father of Hannibalianus and Dalmatius (executed)
 * September —, son of Constantius Chlorus and father of and  (executed)
 * September — Patricius Optatus (executed)
 * September —, of the Imperial Guard (executed)
 * , (probable date)
 * , Patriarch of Constantinople