350

By place

Roman Empire

• January 18 - The Western Roman Emperor Constans I makes himself extremely unpopular; one of his generals, Magnus Magnentius, is proclaimed emperor at Augustodunum in the Diocese of Galliae, with the support of the army on the Rhine frontier.
• January - Constans I flees towards Spain, where he is subsequently assassinated at Castrum Helenae. Magnentius rules the Western Roman Empire and is far more tolerant towards Christians and Pagans alike.
• March 1 - Vetranio is asked by Constantina, sister of Constantius II, to proclaim himself Caesar. Constantius accepts the new emperor and sends him funds to raise an army.
• June 3 - Iulius Nepotianus, Roman usurper, proclaims himself "emperor" and enters Rome with a group of gladiators.
• June 30 - Nepotianus is defeated and killed by Marcellinus, a trusted general sent by Magnentius. His head is put on a spear and carried around the city.
• December 25 - Vetranio meets Constantius II at Naissus and joins forces with him. Vetranio is forced to abdicate his title, and Constantius allows him to live as a private citizen on a state pension.

  Asia

• King Pushyavarman establishes the Varman Dynasty in Assam.
• About this time the Huns begin to invade the Sassanid Empire.
• The city of Anbar is founded by king Shapur II.
• The Wei-Jie war breaks out in North China.

  By topic

Art

• The church of Santa Constanza in Rome is finished.