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Saint May 25 : St. Pope Gregory VII - formerly Hildebrand who Purified the Church by a Reformation of the Clergy
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Building the Ideology of Papal Monarchy Through Excommunication and Interdict: A comparison of Gregory VII and Innocent III - Medievalists.net
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Pope Gregory VII vs. Emperor Henry IV: the Assertion of Medieval Papal Authority – Brewminate: A Bold Blend of News and Ideas
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