two little windows that are in the Company of Gesu, in
one of which is a Christ, and in the other a S. Onofrio. These are
no little different from his early works, and much better.

Now while Guglielmo, as has been related, was living in Cortona,
there died at Arezzo one Fabiano di Stagio Sassoli, an Aretine, who
had been a very good master of the making of large windows.
Thereupon the Wardens of Works for the Vescovado gave the commission
for three windows in the principal chapel, each twenty braccia in
height, to Stagio, the son of the said Fabiano, and to the painter
Domenico Pecori; but when these were finished and fixed in their
places, they gave no great satisfaction to the Aretines, although
they were passing good and rather worthy of praise than otherwise.
It happened at this time that Messer Lodovico Belichini, an
excellent physician, and one of the first men in the government of
the city of Arezzo, went to Cortona to cure the mother of the
aforesaid Cardinal; and there he became well acquainted with our
Guglielmo, with whom, when he had time, he was very willing to
converse. And Guglielmo, who was then called the Prior, from his
having received about that time the benefice of a priory, likewise
conceived an affection for that physician, who asked him one day
whether, with the good will of the Cardinal, he would go to Arezzo
to execute some windows; at which Guglielmo promised that he would,
and with the permission and good will of the Cardinal he made his
way to that city. Now Stagio, of whom we have spoken above, having
parted from the company of Domenico, received Guglielmo into his
house; and the latter, for his first work, executed for a window of
the Chapel of S. Lucia, belonging to the Albergotti, in the
Vescovado of Arezzo, that Saint and a S. Sylvester, in so good a
manner that the work may truly be said to be made with living
figures, and not of coloured and transparent glass, or at least to
be a picture worthy of praise and marvellous. For besides the
mastery shown in the flesh-colours, the glasses are flashed; that
is, in some places the first skin has been removed, and the glass
then coloured with another tint; by which is meant, for example, the
placing of yellow over red flashed glass, or the application of
white and green over blue; which is a difficult and even miraculous
thing in this craft. The first or true colour, then, such as red,
blue, or green, covers the whole of one side; and the ot