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constantine decided to find a new capital for the emperor. Constantinople was a capital in the Byzantine empire and was good place for trade
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by the time Valens took over rome, rome almost fell. the citizens were send to different capitals such as Constantinople.
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The Roman Empire split into half, east and west in AD 284. there were political instability, economic, and social problems.
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charlemange's grandsons played a good role in keeping the Frankish empire without falling. charlemange's goal was to unite all the christian empires.