Calixtus III

Calixtus III

noun
(Alfonso de Borja; Alfonso Borgia) 1378–1458, Spanish ecclesiastic: pope 1455–58.
Also, Callistus III.
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Encyclopedia Britannica
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calixtus iii

antipope from 1168 to 1178, who reigned with the support of the Holy Roman emperor Frederick I Barbarossa.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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