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Callistus III,1378–1458, pope (1455–58), a Spaniard (b. Játiva) named Alonso de Borja or, in Italian, Alfonso Borgia; successor of Nicholas V. He acted as arbitrator between his friend Alfonso V of Aragón and the papacy, and for this he was made a cardinal (1444). Calixtus was elected soon after the fall of Constantinople, and he promptly proclaimed a crusade against the Turks. He spared nothing to aid John HunyadiHunyadi, John
, Hung. Hunyadi János, c.1385–1456, Hungarian national hero, leader of the resistance against the Ottomans. He was chosen (1441) voivode [governor] of Transylvania under King Uladislaus I (Ladislaus III of Poland) and won numerous victories over
..... Click the link for more information. , who won a victory with St. John Capistran at Belgrade (1456). In 1457, Calixtus turned to ScanderbegScanderbeg
, c.1404–1468, Albanian national hero. His original name was George Castriota or Kastriotes, but the Ottomans called him Iskender Bey, and this was corrupted into Scanderbeg.
..... Click the link for more information. , in Albania, sent him money, and named him captain general of the crusade. Calixtus' reign was embittered by a quarrel with Alfonso, who expected returns, notably the march of Ancona, for his friendship. The pope would not give away church lands and resented Alfonso's failure to help the crusade. Calixtus' nepotism gave the Borgia family its position in Italy. Calixtus was, like other Borgias, an able administrator. He was succeeded by Pius II.