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Facing a crisis at all levels, Emperor Theodosius decide the Empire between his two sons:
Honorius received the western half, with Rome as its capital.
Arcadius received the eastern half, with Constantinople (now Istanbul) as its capital. -
However, the division did not improve the situation in the western half of the Empire. The Visigoths were able to cross the limes and ransack Rome.
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The Heruli overthrew Romulus Augustulus, the last Roman emperor in the West. For many historians, this event marks the end of Antiquity and the start of the Middle Ages.