15th March » Constantius II elevates his cousin Constantius Gallus named Gallus to Caesar (title) or Caesar, and puts him in charge of the Eastern part of the Roman Empire.
7th May » The Jewish revolt against Gallus breaks out. After his arrival at Antioch, the Jews begin a rebellion in Palestine.
28th September » Battle of Mursa Major: the Roman Emperor Constantius II defeats the Roman usurper called usurper Magnentius.