Visigoths under Alaric I enter and sack Rome, the first time in about 800 years the city had fallen to a foreign enemy.
Date given in the Julian calendar.
After the death of Theodosius I, the empire is divided between his two sons into Western and Eastern halves, never to be reunited.
Emperor Theodosius I proclaims Nicene Christianity the state religion of the Roman Empire.
The Goths, many of whom had crossed the Danube fleeing the Huns, crush a Roman army and kill Emperor Valens.
A Roman and Visigothic coalition under Aetius halts the invasion of Gaul by Attila and the Huns.
Odoacer deposes Romulus Augustulus, the last Western Roman emperor, a conventional end of antiquity in Europe.
Emperor Constantine I dedicates Constantinople as the new capital of the Roman Empire.