Byzantine territory . In to fulfill their alliance , Pepin gave this territory to Stephen in the Donation of Pepin , freeing Rome from Byzantine control . This conferred authority over these territories was the beginning of the papal states , dramatically increasing the political influence and religious power of the papacy . The papal power was confirmed and supported by Charlemagne . In 799 , Pope Leo III had been mistreated by the Romans and sequestered . Charlemagne came to his aid and Leo crowned him emperor on...











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