aced a picture, and
in addition that Margaritone should make a marble tomb for the Pope
in the Vescovado. He set to work upon the task and brought it to such
a successful completion, introducing the Pope's portrait from life
both in marble and in painting, that it was considered to be the best
work which he had ever produced.

Margaritone then set to work to complete the Vescovado, following the
design of Lapo, and he displayed great activity; but he did not
complete it, for a few years later, in 1289, war broke out again
between the Florentines and Aretines, through the fault of Guglielmo
Ubertini, bishop and lord of Arezzo, aided by the Tarlati of
Pietramela and by the Pazzi of Val d'Arno, when all the money left by
the Pope for the building of the Vescovado was expended upon the war,
while evil befell the leaders, who were routed and slain at
Campaldino. The Aretines then ordained that the tolls paid by the
surrounding country, called a _dazio_, should be set aside for the
use of the building, and this toll has lasted to our own day. To
return to Margaritone, he seems to have been the first, so far as one
can judge by his works, who thought it necessary to take precautions,
when painting on wood, that the joints should be secure, so that no
cracks or fissures should appear after the completion of the
painting, and it was his practice to cover the panel completely with
canvas, fastened on by a strong glue made of shreds of parchment and
boiled in the fire; he then treated the surface with gypsum, as may
be seen in many of his own pictures and in those of others. Over the
gypsum, thus mixed with the glue, he made lines and diadems and other
rounded ornaments in relief; and it was he who invented the method of
grounding in bol-ar-moniac, on which he laid gold leaf which he
afterwards burnished. All these things which had never been seen
before may be noticed in his works, especially in an antependium in
the Pieve of Arezzo, which contains scenes from the life of St
Donate, and also in S. Agnesa and S. Niccolo in the same city.

Margaritone produced many works in his own country which were sent
out of it, part of which were at Rome in S. Giovanni and in St
Peter's, and some at S. Caterina at Pisa, where there is a St
Catherine of his over an altar in the transept, containing many small
figures in a representation of her life, and also a panel of St
Francis with many subjects from his life, on a gold ground. In the
upp