Birth of Constantine II at Arles to Constantine I and Fausta.
March 1
Constantine II made Caesar.
Constantine the Great and Licinius fight at the Battle of Mardia, where both sides take heavy losses. They agree to promote Crispus, Constantine II, and Licinius II to Caesars.
Constantine II accompanies his father Constantine the Great on campaign in Sarmatia.
Constantine II’s own court is established at Trier.
Constantine II made field commander by Constantine the Great against the Goths.
Constantine II married, though we don’t know to whom.
September 9
Death of Constantine the Great. Constans, Constantine II, and Constantius II become emperors and divide the empire.
Constantine II leads a successful campaign against the Alamanni.
Constantine II attempts to dictate legislation to Africa, which is part of the territory of his brother, Constans.
Constantine II leads an army into Italy against his brother Constans, only to be ambushed and killed. Constans takes over the territory of Constantine II.