appended to the work and the supposed endorsement of Cologne University for it are problematic. The letter of Innocent VIII is not an approval of the book to which it was appended, but rather a charge to inquisitors to investigate diabolical sorcery and a warning to those who might impede them in their duty, that is, a papal letter in the by then conventional tradition established by John XXII and other popes through Eugenius IV and Nicholas V (1447–55). Other events In 1487, Innocent confirmed Tomas de Torquemada as Grand Inquisitor of Spain. Also in 1487, Innocent issued a bull Id Nostri Cordis denouncing the views of the Waldensians (Vaudois), offering plenary indulgence to all who should engage in a Crusade against them. Alberto de' Capitanei, archdeacon of Cremona, responded to the bull by organizing a crusade to fulfill its order and launched an offensive in the provinces of Dauphiné and Piedmont. Charles I, Duke of Savoy eventually interfered to save his territories from further confusion and promised the Vaudois peace, but not before the offensive had devastated the area and many of the Vaudois fled to Provence and south to Italy. The noted Franciscan theologian Angelo Carletti di Chivasso, whom Innocent in 1491 appointed as Apostolic Nuncio and Commissary, conjointly with the Bishop of Mauriana, was involved in reaching the peaceful agreement between Catholics and Waldensians. In 1486, Innocent VIII was persuaded that at least thirteen of the 900 theses of Giovanni Pico della Mirandola were heretical, and the book containing the theses was interdicted. In Rome, he ordered the Belvedere of the Vatican to be built, intended for summer use, on an unarticulated slope above the Vatican Palace. His successor would later turn the building into the Cortile del Belvedere. In season, he hunted at Castello della Magliana, which he enlarged. Constantly confronted with a depleted treasury, he resorted to the objectionable expedient of creating new offices and granting them to the highest bidders. The fall of Granada in January 1492, was celebrated in the Vatican and Innocent granted Ferdinand II of Aragon the epithet "Catholic Majesty." Slavery It was noted that the attitude of Renaissance popes towards slavery, a common institution worldwide in contemporary cultures, varied. Minnich states that those who allowed the slave trade did so in the hope of gaining converts to Christianity. In the case of Innocent he permitted trade with Barbary merchants in