Important Historical Events of the year 421, Year 421 in History

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List of 421 Major News Events in History, Most Important Historical Events in 421

What happened in the year 421?

Date	Event
February 8, 421	Constantius III becomes co-Emperor of the Western Roman Empire.
March 25, 421	Italian city Venice is founded with the dedication of the first church, that of San Giacomo di Rialto on the islet of Rialto.
June 7, 421	Emperor Theodosius II marries Aelia Eudocia at Constantinople (Byzantine Empire).