Constantine II, 316–40, Roman emperor, son of Constantine I. When the empire was divided at the death (337) of Constantine I, among the brothers Constantius II, Constans I, and Constantine II, Constantine II received Britain, Gaul, and Spain. Maintaining that he had been cheated, he demanded some of the territory given Constans I. In an invasion of Italy intended to win some of that territory, he was killed in an ambush.
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