Answer:
The two churches disagreed over the running of the church. The pope claimed he was the head of all Christian churches, but Byzantines thought other bishops were equal to the pope. In the late A.D. 700s, the Byzantine emperor refused to help the pope when Italy was invaded, which angered the pope. The pope received help from the Franks, and consequently gave Charlemagne, leader of the Franks, the title of Emperor. Finally in A.D.1054 the pope and the patriarch of Constantinople excommunicated each other.
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