350

350 Anno Domini was the 350th year after Christ’s birth and was 1103 years after the founding of Rome.

January
Jan 18 - Due to the unpopularity of Western Roman Emperor Constans I, general Magnus Magnentius is proclaimed emperor in Augustodunum (Autun), with the support of Britannia, Gaul, Hispania, and the Rhine frontier. This is the beginning events of the Roman Civil War (350-353).

Late Jan - With Constans I without supporters, he is forced to flee to Hispania.

February
Feb 11 - While attempting to flee to Hispania, Constans I is assassinated at Castrum Helanae (Elne), just east of the Pyrenees.

March
Mar 1 - Sister of Constantius II, Constantina persuades Roman soldier Vertranio to ask the Emperor to elevate him to a Caesar. Constantius II accepts as co-emperor.

June
Jun 3 - Julius Nepotianus is proclaimed Roman emperor in Rome in opposition to Magnus Magnentius.

Jun 30 - Magnentius' ally Marcellinus defeats and kills Nepotianus.

December
Dec 25 - On the arrival of Vertranio in Naissus where Constantius II was preparing for his campaign against usurper Magnus Magnentius, he persuades Vertranio to give up his titles, which he obliges to.

Not Applicable
Spring/Summer - Siege of Nisibis (350), Romans hold off Persian siege on Nisibis, war continues without conflict for 9 years.