The Pope then causing the fortress to be built in Perugia where there had stood the houses of the Baglioni, Antonio da San Gallo, having sent for Mosca, gave him the charge of making the ornaments; where there were executed after his designs all the doors, windows, chimney-pieces, and other suchlike things, and in particular two large and very beautiful escutcheons of his Holiness. In that work Simone formed a connection with M. Tiberio Crispo, who was Castellan there; and he was sent by M. Tiberio to Bolsena, where, on the highest point of that stronghold, overlooking the lake, he arranged a large and beautiful habitation, partly on the old structure and partly founding anew, with a very handsome flight of steps and many ornaments of stone. Nor did any long time pass before Messer Tiberio, having been made Castellan of the Castello di S. Angelo, caused Mosca to go to Rome, where he made use of him in many matters in renovating the apartments of that castle; and, among other things, he caused him to make over the arches that rise over the new loggia, which faces towards the meadows, two escutcheons of the above-named Pope in marble, which are so well wrought and perforated in the mitre, or rather, triple crown, in the keys, and in certain festoons and little masks, that they are marvellous. Having then returned to Orvieto in order to finish the work of the chapel, he laboured there continuously all the time that Pope Paul was alive, executing it in such a manner that it proved to be, as may be seen, no less excellent than the first, and perhaps even better. For Mosca, as has been said, bore such love to art, and took such pleasure in working, that he could never have enough of it, almost striving after the impossible, and that rather from a desire for glory than from any wish to accumulate gold, for he was more pleased to work well at his profession than to acquire property.