Galla Placidia, born in 388, was the daughter of Theodosius I. She was the Roman empress of the West. During the campaign of Italy by Alaric I and the Visigoths, she was held hostage and married Alaric's successor Ataulf. After his murder, she was ill-treated, then returned to her brother Honorius. In 417, she married Constantius, and shortly before his death he was made coemperor as Constantius III. After her brother's death, she became regent for her son Valentinian III. She had great personal influence over her son, but was forced to leave the government. She died in 450.