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 went on to lead campaigns against various barbarian groups in Hispania and Gaul, recovering much of both for the Western Roman Empire. He married Honorius's sister Galla Placidia in 417, a sign of his ascendant status, and was proclaimed co-emperor by Honorius on 8 February 421. Constantius reigned for seven months before dying on 2 September 421.
Constantius III, Roman emperor
On September 2, in the year 421, Constantius III, Roman emperor. This event is recorded as a Notable Deaths event in the history of September 2, one of 443 recorded events on this date across all of history.
1 notable person is associated with this event, including Constantius III. Learn more below.
Key Facts
- This event took place on September 2, 421 (AD era).
- It is categorised as a Notable Deaths event in recorded history.
- Referenced in 1 Wikipedia article.
- 1 notable person is recorded as involved in or associated with this event.
- Wikipedia source last updated on 23 August 2026.
On This Date in History 443
This article draws on content from Wikipedia, available under CC BY-SA 4.0.
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