What is the state religion of Charlemagne, Byzantium under Justinian, under Harun ar-Rashid?

Under Charlemagne, the main religion of the Frankish kingdom was Christianity.

During the reign of Emperor Justinian, Christianity was also the main state religion. We can say that the Byzantine Empire was the center of the Christian religion for a long time.

Under Harun-Ar-Rashid, the state religion of the Arab Caliphate was Islam, that is, the state was Muslim.



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