The Prior was a very honourable person, and delighted in agriculture and in making alterations in buildings; wherefore, having bought a most beautiful house, he made in it a vast number of improvements. As a man of religion, he was always most upright in his ways; and the remorse of conscience, on account of his departure from his convent, kept him sorely afflicted. For which reason he made a very beautiful window for the Chapel of the High-altar in S. Domenico, a convent of his Order at Arezzo; wherein he depicted a vine that issues from the body of S. Dominic and embraces a great number of sanctified friars, who constitute the tree of the Order; and at the highest point is Our Lady, with Christ, who is marrying S. Catherine of Siena--a work much extolled and of great mastery, for which he would accept no payment, believing himself to be much indebted to that Order. He sent a very beautiful window to S. Lorenzo in Perugia, and an endless number of others to many places round Arezzo. And because he took much pleasure in matters of architecture, he made for the citizens of that country a number of designs of buildings and adornments for their city, such as the two doors of S. Rocco in stone, and the ornament of grey-stone that was added to the panel-picture of Maestro Luca in S. Girolamo; and he designed an ornament in the Abbey of Cipriano d' Anghiari, and another for the Company of the Trinita in the Chapel of the Crocifisso, and a very rich lavatory for the sacristy; which were all executed with great perfection by the stone-cutter Santi. Finally, ever delighting in labour, and continually working both winter and summer at his mural painting, which breaks down the healthiest of men, he became so afflicted by the damp and so swollen with dropsy, that his physicians had to tap him, and in a few days he rendered up his soul to Him who had given it. First, like a good Christian, he partook of the Sacraments of the Church, and made his will. Then, having a particular devotion for the Hermits of Camaldoli, who have their seat on the summit of the Apennines, twenty miles distant from Arezzo, he bequeathed to them his property and his body, and to Pastorino da Siena, his assistant, who had been with him many years, he left his glasses, his working-instruments, and his designs, of which there is one in our book, a scene of the Submersion of Pharaoh in the Red Sea. This Pastorino afterwards applied himself to many other fields of art, and also to glass windows, although the works that he produced in that craft were but few. Guglielmo was much imitated, also, by one Maso Porro of Cortona, who was more able in firing and putting together the glass than in painting it. One of the pupils of Guglielmo was Battista Borro of Arezzo, who continues to imitate him greatly in the making of windows; and he also taught the first rudiments to Benedetto Spadari and to Giorgio Vasari of Arezzo.