 Piccolomini and Carvajal, who succeeded Cardinal Cesarini, were finally able to bring about the treaty known as the Concordat of the Princes (1447), in which Pope Eugenius acknowledged that a general council was superior to a pope.Carvajal was also instrumental in negotiating the Concordat of Aschaffenburg (or Vienna) (1448), which supported the Papacy against the members of the Church.He was rewarded by Pope Eugene IV on 14 December 1446 with the Cardinal's hat and the title of St. Angelo in Foro Piscium or "in Pescheria".