What shared belief of justinian and charlemagne how build cultural unity in europe

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Answer- Justinian was Greek, and Charlemagne was Frankish; but they were both Christian. Christianity had spread across Europe during the time of the Roman Empire, and when the Empire fell, the Church became a unifying element among the diverse cultures of Europe that otherwise had little in common.

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-AcEdd

what are the following?

explanation:

b

being given a fair trial before a jury