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In page Pope Gregory VII:
"In the same year Gregory VII summoned a council in the Lateran palace, which condemned simony and confirmed celibacy for the Church's clergy. These decrees were further stressed, under menace of excommunication, the next year (24–28 February).[9] In particular, Gregory decreed that only the Pope could appoint or depose bishops or move them from see to see, an act which was later to cause the Investiture Controversy.[citation needed]
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