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Calixtus III
(kə-lĭkˈstəs) or Cal·lis·tus III (-lĭsˈtəs) Originally Alfonso Borgia. 1378-1458.
Pope (1455-1458) who tried unsuccessfully to set in motion a crusade to recapture Constantinople from the Turks and whose nepotism empowered the Borgia family in Italy.