Constantius III definition of Constantius III in the Free Online Encyclopedia.

Constantius III, d. 421, Roman emperor of the West (421). In 411, as general of Honorius Honorius, 384–423, Roman emperor of the West (395–423). On the death (395) of Theodosius I, the Roman Empire was divided; Arcadius, the elder son, received the East, and Honorius, the younger son, received the West.
..... Click the link for more information. , he defeated Gerontius and Constantine; thereafter he was the virtual ruler of the West. Aspiring to the hand of Honorius' sister Galla Placidia Galla Placidia , c.388–450, Roman empress of the West, daughter of Theodosius I. Captured by Alaric I in the course of his Italian campaign, she was held by the Visigoths as a hostage and married (414) Alaric's successor Ataulf.
..... Click the link for more information. , he vied with his rival, Ataulf Ataulf , d. 415, Visigothic king (410–15). Succeeding his brother-in-law, Alaric I, he abandoned Alaric's scheme of southward expansion and led the Visigoths out of Italy into S Gaul (France) in 412.
..... Click the link for more information. , the Visigothic king, and drove him from Gaul into Spain shortly after Ataulf's marriage (414) to Galla Placidia. In 416, after Ataulf was assassinated, he made peace with the new Visigothic king, Wallia, and in 417 he married Galla Placidia. He was the prime mover in granting (418) local government to Gaul and in settling (419) the Visigoths in Aquitaine. In 421 Galla Placidia persuaded Honorius to make Constantius coemperor, but Constantius died a few months after his accession. He was the father of Valentinian III.

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