While the stucco-work of this vaulting was in progress, and Perino was considering the designs for his scenes, the old walls of the Church of S. Pietro at Rome were being pulled down to make way for those of the new building, and the masons came to a wall where there was a Madonna, with other pictures, by the hand of Giotto; which being seen by Perino, who was in the company of Messer Niccolo Acciaiuoli, a Florentine doctor and much his friend, both of them were moved to pity for that picture and would not allow it to be destroyed; nay, having caused the wall to be cut away around it, they had it well braced with beams and bars of iron and deposited below the organ of S. Pietro, in a place where there was neither altar nor any other consecrated object. And before the wall that had been round the Madonna was pulled down, Perino copied the figure of Orso dell' Anguillara, the Roman Senator who had crowned M. Francesco Petrarca on the Campidoglio, and who was at the feet of that Madonna. Round the picture of the Madonna were to be made some ornaments in stucco and painting, and together with them a memorial to a certain Niccolo Acciaiuoli, who had formerly been a Roman Senator; and Perino, having made the designs, straightway set his hand to the work, and, assisted by his young men and by Marcello Mantovano, his disciple, carried it out with great diligence. In the same S. Pietro the Sacrament did not occupy, with regard to masonry, a very honourable position; wherefore certain deputies were appointed from the Company of the Sacrament, who ordained that a chapel should be built in the centre of the old church by Antonio da San Gallo, partly with remains in the form of ancient marble columns, and partly with other ornaments of marble, bronze, and stucco, placing in the centre a tabernacle by the hand of Donatello, by way of further adornment; and Perino executed there a very beautiful ceiling with many minute scenes full of figures from the Old Testament, symbolical of the Sacrament. In the middle of it, also, he painted a somewhat larger scene, containing the Last Supper of Christ with the Apostles, and below it two Prophets, one on either side of the body of Christ.