451
| Years: 447 448 449 450 – 451 – 452 453 454 455 | |
| Decades: 420s 430s 440s – 450s – 460s 470s 480s | |
| Centuries: 4th century – 5th century – 6th century | |
Events
- April 7 – The Huns sack Metz
- June 20 – Attila, king of the Huns is defeated at Troyes by Aetius in the Battle of Chalons.
- Thorismund succeeds Theodorid his father as king of the Visigoths.
- October 8 – Council of Chalcedon, Ecumenical council of the Christian church. As a result of this council the Oriental Orthodox churches became a separate communion.
- Jerusalem becomes a Patriarchate.
- The Oriental Orthodox churches separate from the rest of the church.
- Dioscorus of Alexandria is deposed as Patriarch of Antioch.
- Sassanid ruler Yazdegerd II of Persia's decree abolishes the Sabbath and orders executions of Jewish leaders, including the Exilarch Mar Nuna.
Births
- Jacob of Serugh – Syriac author
- Brigid of Ireland – Irish saint
Deaths
- Nestorius, founder of Nestorianism (estimated date)
- Theodorid, king of the Visigoths (killed in the Battle of Chalons)
Categories: 451