 Cardinal Scarampi, who was working in the interests of King Alfonso V of Aragon who wished to pursue a war against Genoa and needed a complacent pope, pressed the candidacy of Cardinal Alfonso Borgia, who was seventy-six years old, a friend of King Alfonso, and eager to launch a crusade against the Ottoman Turks.On 8 April 1455 Borgia was elected; he chose the name Calixtus III.In 1455 Carvajal was sent by Pope Callistus III to Hungary to preach a vigorous crusade against the Turks, and for six years was the leader of the first effectual resistance made by Christian Europe to the progress of the Ottoman conquerors of Constantinople (1453).