425
| Years: 421 422 423 424 - 425 - 426 427 428 429 | |
| Decades: 390s 400s 410s - 420s - 430s 440s 450s | |
| Centuries: 4th century - 5th century - 6th century | |
Events
- October 23 -Valentinian III becomes western Roman emperor.
- Aetius leads an army into Italy to support the self-proclaimed emperor Joannes.
- Last known usage of Demotic.
- The Sanhedrin is disbanded by the Roman Empire.
- Buddhism begins to spread to Southeast Asia.
- October 10 - Atticus, Patriarch of Constantinople
- Joannes, usurper in the western Roman Empire.