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he divided the roman empire, he made bryzantinun the eastern part of Roman Empire. bryzantinun was later called constantinople betwen the black sea and the mediterranean
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Justinian the great expand the bryzantine empire to his maximun, defeated Vandals and Orthogoths, conquer Italian Peninsula and parts on North Africa
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Arabs conquer a half of the bryzantine empire
Bulgarians defeated Bryzantines