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Theodoric was elected by opponents of Pope Paschal II, following the death of Antipope Clement III.

Antipope Theodoric

Catholic antipope from 1100 to 1101

Theodoric was an antipope in 1100 and 1101, in the schism that began with Wibert of Ravenna in 1080, in opposition to the excesses of Pope Gregory VII and in support of the Emperor Henry IV.
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Pope Paschal II

Head of the Catholic Church from 1099 to 1118

Pope Paschal II, born Raniero Raineri di Bleda, was head of the Catholic Church and ruler of the Papal States from 13 August 1099 to his death in 1118. A monk of the Abbey of Cluny, he was created the cardinal-priest of San Clemente by Pope Gregory VII (1073–85) in 1073. He was…
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Antipope Clement III

Catholic antipope from 1080 to 1100

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. Gregory was the leader of the movement in the church which opposed the traditional claim of European monarchs…
Source: Wikipedia (CC BY-SA)