Roman Empire Permanently Split Between East and West
On January 17, 395, Emperor Theodosius I died in Milan, and the already-fractured Roman Empire was formally divided between his two sons. Arcadius inherited the eastern half, ruling from Constantinople, while Honorius took control of the western half, centered on Ravenna. The split was more than administrative: it hardened religious, cultural, and political differences that had been building for decades. Historians often treat this date as the moment the unified Roman Empire truly ceased to exist as a single entity.