Clement III


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Clement III,

antipope: see Guibert of RavennaGuibert of Ravenna
, d. 1100, Italian churchman, antipope (1080–1100) Clement III, b. Parma. As imperial chancellor of Italy (1057–63), he consistently supported the Holy Roman emperor's opposition to papal reform efforts, and he led the party that repudiated Pope
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.