A variant or proper noun form referring to Calixtus (also spelled Callistus), particularly referring to early Christian popes of that name or historical figures.
From Latin Calixtus, a name of Greek origin meaning 'beautiful'; historically used for several important early church leaders, including Pope Calixtus II.
Pope Calixtus III (1405-1458) was the one who pushed for crusades against the Ottoman Empire and organized exploration—basically commissioning the voyages that would lead to Columbus.
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