nd to show his worth in this
undertaking, and he made his figures very large on account of the
height, after the manner of the works in Michelagnolo's chapel. And
so mightily did his wish to become excellent in such an art avail in
him, that although he was fifty years of age, he improved little by
little in such a manner, that he showed that his knowledge and
comprehension of the beautiful were not less than his delight in
imitating the good in the execution of his work. He went on to
represent the earlier events of the New Testament, even as in the
three large works he had depicted the beginning of the Old. For this
reason, therefore, I am inclined to believe that any man of genius
who has the desire to attain to perfection, is able, if he will but
take the pains, to make naught of the limits of any science. At the
beginning of those works, indeed, he was alarmed by their size, and
because he had never executed any before; which was the reason that
he sent to Rome for Maestro Giovanni, a French miniaturist, who,
coming to Arezzo, painted over S. Antonio an arch with a Christ in
fresco, and for that Company the banner that is carried in
processions, which he executed with great diligence, having received
the commission for them from the Prior.

At the same time Guglielmo made the round window for the facade of
the Church of S. Francesco, a great work, in which he represented
the Pope in Consistory, with the Conclave of Cardinals, and S.
Francis going to Rome for the confirmation of his Rule and bearing
the roses of January. In this work he proved what a master of
composition he was, so that it may be said with truth that he was
born for that profession; nor may any craftsman ever think to equal
him in beauty, in abundance of figures, or in grace. There are
innumerable windows executed by him throughout that city, all most
beautiful, such as the great round window in the Madonna delle
Lacrime, containing the Assumption of Our Lady and the Apostles, and
a very beautiful window with an Annunciation; a round window with
the Marriage of the Virgin, and another containing a S. Jerome
executed for the Spadari, and likewise three other windows below, in
various parts of the church; with a most beautiful round window with
the Nativity of Christ in the Church of S. Girolamo, and another in
S. Rocco. He sent some, also, to various places, such as Castiglione
del Lago, and one to Florence for Lodovico Capponi, to be set up in
S.