He was the only son of Galla Placidia, the younger half-sister of the western emperor Honorius, and Flavius Constantius, who was at the time Patrician and the power behind the throne.
He was the only son of Galla Placidia, the younger half-sister of the western emperor Honorius, and Flavius Constantius. Flavius Constantius was at the time Patrician behind the throne. Flavius Constantius was at the power behind the throne.