421

Events

• February 8 - Constantius III becomes Co-Emperor of the Western Roman Empire
• June 7 - Roman Emperor Theodosius II marries Aelia Eudocia, formerly known as Athenais.
• Theodosius declares war on Persia.
• Traditional date of the foundation of Venice. (The real foundation may well have been over a century later.)

Births

Deaths

• September 2 - Constantius III, Co-Emperor of the Western Roman Empire
• Emperor Gong of Jin China