This work finished, in the same year, 1283, Giovanni went to Naples, where, for King Charles, he made the Castel Nuovo of Naples; and in order to have room and to make it stronger, he was forced to pull down many houses and churches, and in particular a convent of Friars of S. Francis, which was afterwards rebuilt no little larger and more magnificent than it was before, far from the castle and under the title of S. Maria della Nuova. These buildings being begun and considerably advanced, Giovanni departed from Naples, in order to return to Tuscany; but arriving at Siena, without being allowed to go on farther he was caused to make the model of the facade of the Duomo of that city, and afterwards the said facade was made very rich and magnificent from this model. Next, in the year 1286, when the Vescovado of Arezzo was building with the design of Margaritone, architect of Arezzo, Giovanni was brought from Siena to Arezzo by Guglielmino Ubertini, Bishop of that city, where he made in marble the panel of the high-altar, all filled with carvings of figures, of foliage, and other ornaments, distributing throughout the whole work certain things in delicate mosaic, and enamels laid on plates of silver, let into the marble with much diligence. In the middle is a Madonna with the Child in her arms, and on one side S. Gregory the Pope, whose face is the portrait from life of Pope Honorius IV; and on the other side is S. Donatus, Bishop and Protector of that city, whose body, with those of S. Antilla and of other Saints, is laid under that same altar. And because the said altar stands out by itself, round it and on the sides there are small scenes in low-relief from the life of S. Donatus, and the crown of the whole work are certain tabernacles full of marble figures in the round, wrought with much subtlety. On the breast of the said Madonna is a bezel-shaped setting of gold, wherein, so it is said, were jewels of much value, which have been carried away in the wars, so it is thought, by soldiers, who have no respect, very often, even for the most holy Sacrament, together with some little figures in the round that were on the top of and around that work; on which the Aretines spent altogether, according to what is found in certain records, 30,000 florins of gold. Nor does this seem anything great, seeing that at that time it was something as precious and rare as it could well be; wherefore Frederick Barbarossa, returning from Rome, where he had been crowned, and passing through Arezzo, many years after it had been made, praised it, nay, admired it infinitely; and in truth with great reason, seeing that, besides everything else, the joinings of this work, made of innumerable pieces, are cemented and put together so well that the whole work is easily judged, by anyone who has not much practice in the matters of the art, to be all of one piece. In the same church Giovanni made the Chapel of the Ubertini, a most noble family,