268–283. The emperors Claudius, Aurelian, Tacitus, Probus, and Carus defeat the various enemies of Rome, and restore order in the Roman state.
285. Diocletian divides and reorganizes the Roman empire. After his abdication in 305 a fresh series of civil wars and confusion ensues. Constantine, the first Christian emperor, reunites the empire in 324.
330. Constantine makes Constantinople the seat of empire instead of Rome.
363. The emperor Julian is killed in action against the Persians.
364–375. The empire is again divided, Valentinian being emperor of the West, and Valens of the East. Valentinian repulses the Alemanni, and other German invaders from Gaul. Splendor of the Gothic kingdom under Hermanric, north of the Danube.
376–395. The Huns attack the Goths, who implore the protection of the Roman emperor of the East. The Goths are allowed to pass the Danube, and to settle in the Roman provinces. A war soon breaks out between them and the Romans, and the emperor Valens and his army are destroyed by them. They ravage the Roman territories. The emperor Theodosius reduces them to submission. They retain settlements in Thrace and Asia Minor.
395. Final division of the Roman empire between Arcadius and Honorius, the two sons of Theodosius. The Goths revolt, and under Alaric attack various parts of both the Roman empires.
410. Alaric takes the city of Rome.
412. The Goths march into Gaul, and in 414 into Spain, which had been already invaded by hosts of Vandals, Suevi, Alani, and other Germanic nations. Britain is formally abandoned by the Roman emperor of the West.
428. Genseric, king of the Vandals, conquers the Roman province of North Africa.
441. The Huns attack the Eastern empire.
