421 in history

421 events chronologically

Feb 8 Constantius III becomes co-Emperor of the Western Roman Empire
Mar 25 Venice is founded at twelve o'clock noon, according to legend
Jun 7 Emperor Theodosius II marries Aelia Eudocia. The wedding was celebrated at Constantinople (Byzantine Empire)
Sep 2 Galla Placidia, wife of the Emperor Constantius III, becomes a widow for the second time when he dies suddenly of an illness

Died in 421

Sep 2 Constantius III Western Roman Emperor for seven months in 421. A prominent general and politician, he was the power behind the throne for much of the 410s, and in 421 briefly became co-emperor of the Western Empire with Honorius