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Honorius declared Constantius III to be his co-emperor of the Western Roman Empire.
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Honorius
Western Roman emperor from 393 to 423
Honorius was Roman emperor from 393 to 423. He was the younger son of emperor Theodosius I and his first wife Aelia Flaccilla. After the death of Theodosius in 395, Honorius, under the regency of Stilicho, ruled the western half of the empire while his brother Arcadius ruled the…Source: Wikipedia (CC BY-SA)
Constantius III
Roman emperor in 421
Constantius III was briefly Western Roman emperor in 421, having earned the throne through his capability as a general under Honorius. By 411 he had achieved the rank of magister militum, and in the same year he suppressed the revolt of the usurper Constantine III. Constantius…Source: Wikipedia (CC BY-SA)
Western Roman Empire
Western half of the Roman Empire
In modern historiography, the Western Roman Empire was the western provinces of the Roman Empire, collectively, during any period in which they were administered separately from the eastern provinces by a separate, independent imperial court. Particularly during the period from…Source: Wikipedia (CC BY-SA)