Birth of Valens in Pannonia.
March
Valentinian I and Valens order the arrest of Procopius, but he escapes with his family.
March 28
Valentinian I selects his brother Valens as co-augustus.
November 1
Valentinian I learns of the revolt of Procopius against Valens and an invasion of Gaul by the Alemanni.
May 27
Valens orders the execution of Procopius.
April
Valens crosses the Danube to attack Athanaric of the Visigoths.
February
Valens and the Visigoths under Athanaric agree to a truce.
Shapur II attacks Armenia but is defeated by Traianus and Vadomarius, generals of Valens.
November 17
Valentinian dies of a stroke in Hungary, leaving Gratian as the sole western Emperor. Valens becomes the senior emperor.
August
Gratian releases an edict of religious tolerance and restores bishops exiled by Valens.
August 9
Valens is killed at the Battle of Adrianople by Gothic rebels. Gratian had earlier sent a letter begging his uncle Valens to wait for his arrival, but it was ignored.