421
Centuries: 4th century - 5th century - 6th centuryDecades: 370s 380s 390s 400s 410s - 420s - 430s 440s 450s 460s 470s
Years: 416 417 418 419 420 - 421 - 422 423 424 425 426
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.
Deaths
- September - Constantius III, Co-Emperor of the Western Roman Empire\n
