 Complete the following phrase:  Juan Carvajal Carvagial c. 1400 in Trujillo, Cáceres  6 December 1469 in Rome was a Spanish Cardinal. Though he began his career as a lawyer and judge in the papal administration, he spent most of his active life travelling as a diplomat in Germany and eastern Europe, attempting to arrange a crusade against the Ottoman Turks. He was particularly active in Bohemia and Hungary, where he also employed his powers to fight the Hussites. He was a mainstay in trying to preserve the institution of the Papacy from the Conciliarism of the 