What Happened in 421 AD
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- Feb 8 Flavius Constantine becomes Co-Emperor as Emperor Constantius III of the Western Roman Empire with Honorius
- Mar 25 Friday at 12 PM - city of Venice founded
- Sep 2 Flavius Constantine III, Emperor of Western Roman Empire, dies at about 51
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List of Years
Gregory I
Gregory XIII
Julius II
Julius III
Leo X
Pius V