Which of these popes was a great reformer of the papacy and the entire western church?

Question

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Gregory VII is widely considered to be a great reformer of the papacy and the western church. He instituted many reforms, including the purification of the clergy, the elimination of simony (the buying and selling of church offices), and the assertion of papal authority over secular rulers. He also reformed the Church's practices regarding canon law and the election of bishops, among other changes.

Which of These Popes Was a Great Reformer of the Papacy