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The Constantine moved to the Constantinople which is 850 miles far from the capital. Because Constantine moved, Rome just become the capital of the Western Roman Empire.
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Barbarians had a war with Rome in late 300's. After in 410, Barbarians attacked the city of the Rome. They killed Roman citizens and robbed the city of Rome.
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Emperor Diocletain decided to split Roman Empire to two because it will be much easier for him to manage. One who ruled Western Rome Empire was senior ruler and one who ruled Eastern Rome Empire was real emperor.
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The Constantine of the Rome wanted Pepin to help him and Pepin become Western Roman Empire's ruler. After, Pepin's son, Charlemange expanded the Frank kingdom.