7th April » Attila or Attila the Hun sacks the town of Metz and attacks other cities in Gaul.
26th May » Battle of Avarayr between Armenians named Armenian rebels and the Sassanid Empire takes place. The Empire defeats the Armenians militarily but guarantees them freedom to openly practice Christianity.
8th October » At Chalcedon, a city of Bithynia in Asia Minor, the first session of the Council of Chalcedon begins (ends on November 1).
22nd October » The Council of Chalcedon adopts the Chalcedonian Creed regarding the divine and human nature of Jesus Christ.