Constantius III

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Constantius III,

d. 421, Roman emperor of the West (421). In 411, as general of HonoriusHonorius,
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. This division proved to be a permanent one.
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, he defeated GerontiusGerontius
, d. 411, Roman general, b. Britain. He at first supported the usurper Constantine (d. 411), and was left in charge of Spain. He set up (409) his own candidate, Maximus, as emperor, at the same time inviting or permitting the entrance of the Alani, Suevi, and Vandals.
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 and ConstantineConstantine,
d. 411, Roman general. He was proclaimed emperor by the Roman troops in Britain in 407 and led a revolt in Gaul and Spain against the Western emperor Honorius. He conquered part of Gaul and, through his son Constans, took Spain.
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; thereafter he was the virtual ruler of the West. Aspiring to the hand of Honorius' sister Galla PlacidiaGalla 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.
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, he vied with his rival, AtaulfAtaulf
, 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.
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, 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 IIIValentinian III,
419–55, Roman emperor of the West (425–55). Two years after the death of his uncle, Honorius, he was placed on the throne by his cousin Theodosius II, who deposed the usurper John.
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