At the same time even Spain was not wholly unmoved by the spirit of unrest and inquiry which marked the second half of the fifteenth century, sapping the foundations of tradition and rejecting the claims of sacerdotalism. About 1460 we learn from Alonso de Espina that many were beginning to deny the efficacy of oral confession, and this point could not have been reached without calling in question many other doctrines and observances which the Church taught to be necessary to salvation. At length these innovators grew so bold that Pedro de Osma, a professor in the great University of Salamanca, ventured to promulgate their obnoxious opinions in print. Oral confession, he asserted, was of human, not of divine precept, and was unnecessary for the forgiveness of sins; no papal indulgence could insure the living from the fires of purgatory; the papacy could err, and had no power to dispense with the statutes of the Church. Had there been any machinery of persecution at hand, short work would have been made with so bold a heretic, but the authorities were so much at a loss what to do with him that they applied to Sixtus IV., who sent a commission to Alonso Carrillo, Archbishop of Toledo, the dignitary next in rank to the king, to try him. In 1479 a council was assembled for the purpose at Alcalà, consisting of fifty-two of the best theologians in Spain, besides a number of canon lawyers. Pedro was summoned to appear, and on his failing to do so his doctrine was condemned as heretical, and he was sentenced--not to the stake for contumacy, but to recant publicly in the pulpit. He submitted and did so, and we are told in the official report of the proceedings that all the faithful burst into tears at this signal manifestation of the conquering hand of God. Pedro died peacefully in the bosom of the Church during the next year, 1480, and Sixtus IV., in confirming the action of the council, ordered the archbishop to prosecute as heretics any of his followers who would not imitate his obedience.[208] Evidently some more efficient and less cumbrous method was requisite if the population of reunited Spain was to enjoy the blessing of uniformity in faith. It did not take long for the piety of Isabella and the policy of Ferdinand to discover appropriate means. * * * * *