| calixtus ii | (n) pope who in 1122 forced the Holy Roman Emperor Henry V to sign a concordat that recognized the right of the church to choose its own leadership (died in 1124), Syn. Guy of Burgundy |
| calixtus iii | (n) Italian pope whose nepotism put the Borgia family in power in Italy (1378-1458), Syn. Alfonso Borgia, Borgia |