421
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| Years: 417 418 419 420 - 421 - 422 423 424 425 | |
| Decades: 390s 400s 410s - 420s - 430s 440s 450s | |
| Centuries: 4th century - 5th century - 6th century | |
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 Chinaaf:421
ast:421 bg:421 bs:421 ca:421 cs:421 de:421 el:421 es:421 eo:421 eu:421 fr:421 ko:421년 hr:421 io:421 it:421 lb:421 nl:421 nb:421 nn:421 pl:421 pt:421 ro:421 ru:421 sk:421 sl:421 sr:421 tt:421 uk:421 zh:421年