September 421 in history

September 421 events chronologically

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 September 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