Gregory VII (ca. 1020-1085) was pope from 1073 to 1085. One of the greatest medieval popes, later canonized, he was a man of intense conviction and will. He vigorously initiated reforms and asserted the papal claim to primacy of jurisdiction in the Church.

Although Gregory VII did not create the grandiose structure of the medieval papacy, he was certainly one of its chief architects. He became pope at a time when powerful forces were striving to rid the Latin Church of moral corruption and organizational confusion, when the papacy had already begun to assume the role of reforming leadership previously filled by emperors, kings, and lesser churchmen, and when imperial control over the Church in Italy (and, therefore, the papacy) had already weakened. Gregory continued the policies he had previously advocated as a prominent member of the papal court. He intensified papal involvement in the reforming movement and directed that...