Constantius III

Constantius, a Roman general, married Galla Placidia, the half-sister of Emperor Honorius. This marriage strengthened his political position and made him a key figure in the Western Roman court.

Constantius was appointed co-emperor of the Western Roman Empire by Honorius, ruling as Constantius III. His reign lasted only seven months before he died of illness, but he was the de facto ruler of the West for years prior.