Under Henry IV and Pope Gregory VII, what central issue was involved pertaining to the Investiture Controversy?

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The Investiture Controversy involved a dispute over who had the authority to appoint bishops and other church officials. Henry IV believed that as king, he had the right to appoint these officials, while Pope Gregory VII insisted that only the Church had the authority to make these appointments. This central issue was at the heart of the controversy and led to conflict between the Church and the state, ultimately resulting in the excommunication of Henry IV.

Under Henry IV and Pope Gregory VII, What Central Issue