404
| Years: 400 401 402 403 - 404 - 405 406 407 408 | |
| Decades: 370s 380s 390s - 400s - 410s 420s 430s | |
| Centuries: 4th century - 5th century - 6th century | |
Events
- January 1 - Last gladiator competition in Rome.
- Atticus of Constantinople becaomes Patriarch of Constantinople.
- Honorius moves the capital of the Western Roman Empire to Ravenna.
Deaths
- Claudian, poet
- February - Flavian I of Antioch, Patriarch of Antioch
- November 11 - Arsacius of Tarsus, Patriarch of Constantinople
Alternate meanings: 404 error in HTTP, 404 area code for Atlanta