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Centuries: 4th century - 5th century - 6th century
- September 20 - Attila, king of the Huns, invades Gaul, but is stopped in his tracks 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