About the same time, during the pontificate of Pope Sixtus IV, there lived in Rome one Baccio Pintelli, a Florentine, who was rewarded for the great skill that he had in architecture by being employed by that Pope in all his building enterprises. With his design, then, were built the Church and Convent of S. Maria del Popolo, and certain highly ornate chapels therein, particularly that of Domenico della Rovere, Cardinal of San Clemente and nephew of that Pope. The same Pontiff erected a palace in Borgo Vecchio after the design of Baccio, which was then held to be a very beautiful and well-planned edifice. The same master built the Great Library under the apartments of Niccola, and that chapel in the Palace that is called the Sistine, which is adorned with beautiful paintings. He also rebuilt the structure of the new Hospital of S. Spirito in Sassia (which was burnt down almost to the foundations in the year 1471), adding to it a very long loggia and all the useful conveniences that could be desired. Within the hospital, along its whole length, he caused scenes to be painted from the life of Pope Sixtus, from his birth up to the completion of that building--nay, up to the end of his life. He also made the bridge that is called the Ponte Sisto, from the name of that Pontiff; this was held to be an excellent work, because Baccio built it with such stout piers and with the weight so well distributed, that it is very strong and very well founded. In the year of the Jubilee of 1475, likewise, he built many new little churches throughout Rome, which are recognized by the arms of Pope Sixtus--in particular, S. Apostolo, S. Pietro in Vincula, and S. Sisto. For Cardinal Guglielmo, Bishop of Ostia, he made the model of his church, with that of the facade and of the steps, in the manner wherein they are seen to-day. Many declare that the design of the Church of S. Pietro a Montorio in Rome was by the hand of Baccio, but I cannot say with truth that I have found this to be so. This church was built at the expense of the King of Portugal, almost at the same time that the Spanish nation had the Church of S. Jacopo erected in Rome.