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Constantius III
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Constantius III

Roman emperor
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Article History
Quick Facts
Died:
September 2, 421, Ravenna, Italy
Title / Office:
emperor (421), Roman Empire
Notable Family Members:
spouse Aelia Galla Placidia
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Constantius III (died September 2, 421, Ravenna, Italy) was a Roman emperor in 421.

Constantius came from Naissus (modern Niš, Serbia) in the province of Moesia. In 411, as magister militum (“master of the soldiers”) under the Western Roman emperor Flavius Honorius (reigned 393–423), Constantius helped to overthrow the usurping emperor Constantine (Flavius Claudius Constantinus) at Arelate (modern Arles, France). He drove the Visigoths from southern Gaul into Spain in 415 but later recalled the tribe and settled it in southwestern Gaul. In 417 he married the emperor’s half sister Aelia Galla Placidia. Appointed co-emperor of the West by Honorius, with the title augustus, on February 8, 421, Constantius died without having been recognized by the Eastern emperor, Theodosius II. Constantius’s son by Placidia ruled the West as the emperor Valentinian III from 425 to 455.

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