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Antipope Clement III

Prelate and archbishop
Guibert or Wibert of Ravenna was an Italian prelate, archbishop of Ravenna, who was elected pope in 1080 in opposition to Pope Gregory VII and took the name Clement III. Wikipedia
Died: September 8, 1100, Civita Castellana, Italy
Papacy began: 25 June 1080
Other post(s): Archbishop of Ravenna