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What is Antipope Callixtus III's real name?

Antipope Callixtus III's real name is Callixtus III.

Callixtus III (also Calixtus III or Callistus III; died between 1180 and 1184) was an antipope from September 1168 until his resignation in August 1178. He was the third antipope elected in opposition to Pope Alexander III during the latter's struggle with the Emperor Frederick Barbarossa.

Source: Wikipedia: Antipope Callixtus III

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