Antipope Callixtus III
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Antipope Callixtus III (or Callistus III) was Antipope from September 1168 to 29 August, 1178.
His real name was Giovanni, Abbot of Stuma. He was a strong and early supporter of Frederick Barbarossa, and also supported Antipope Victor IV, who made him a cardinal.
He was named successor to Antipope Paschal III by a small number of schismatic cardinals. Callixtus was primarily a bargaining chip of Frederick to pressure Alexander III, and he had only limited geographical support. He resided in Viterbo.
Frederick, when it became politically expedient, after the defeat of Legnano, switched his backing to Alexander, in the 1177 Peace of Venice, abjuring his position on 29 August 1178. Callixtus eventually accepted the situation, submitting to Alexander in August 1178. After this he was named rector of Benevento, where he died a few years later.de:Kalixt III. (Gegenpapst) fr:Antipape Calixte III sv:Calixtus III (motpåve)