Saint Gregory VII
See his Correspondence (tr. 1932, repr. 1969); S. Williams, ed., The Gregorian Epoch (1964); Gregory VII–Church Reformer or World Monarch? (1967); H. E. Cowdrey, The Cluniacs and the Gregorian Reform (1970); U.-R. Blumenthal, The Investiture Controversy (tr. 1988).
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