General
Population: Between 190 and 230 million*
- Religion: Council of Chalcedon - start of scism of Eastern and Western churches
- Deaths: Theodoric I King of Visigoths
Europe
- French States: Attila invades Gaul - defeated at Chalons-sur-Marne by Franks, Alemanni, and Romans under Aetius on Catalaunian plain
- Italian States: Atilla invades
- Spanish States: Death of Theodoric I king of Visigoths
- Western Roman Empire: Start of second round of Wars of Western Roman Empire