while he was a youth and placed in the facade of the said Vescovado. In the Pieve, likewise, in the Chapel of S. Biagio, he made a very beautiful figure of the said Saint in terra-cotta; and one of that Saint in the Church of S. Antonio, also in terra-cotta and in relief; and another Saint, seated, over the door of the hospital of the said city. [Illustration: S. MARK (_After_ Niccolo Aretino. _Florence: Duomo_) _Brogi_] While he was making these and some other similar works, the walls of Borgo a San Sepolcro were ruined by an earthquake, and Niccolo was sent for to the end that he might make--as he did with good judgment--a design for a new wall, which turned out much better and stronger than the first. And so, continuing to work now in Arezzo, and now in the neighbouring places, Niccolo was living very quietly and at his ease in his own country, when war, the capital enemy of the arts, compelled him to leave it, for, after the sons of Piero Saccone had been driven out of Pietramala and the castle had been destroyed down to its foundations, the city and the district of Arezzo were all in confusion. Wherefore, departing from that territory, Niccolo betook himself to Florence, where he had worked at other times, and for the Wardens of Works of S. Maria del Fiore he made a statue of marble, four braccia high, which was afterwards placed on the left hand of the principal door of that church. In this statue, which is an Evangelist seated, Niccolo showed that he was truly an able sculptor, and he was therefore much praised, since up to then there had not been seen, as there was afterwards, any better work in wholly round relief. Being then summoned to Rome by order of Pope Boniface IX, as the best of all the architects of his time, he fortified and gave better form to the Castle of S. Angelo. On returning to Florence, he made two little figures in marble for the Masters of the Mint, on that corner of Orsanmichele that faces the Guild of Wool, in the pilaster, above the niche wherein there is now the S. Matthew, which was made afterwards; and these figures were so well made and so well placed on the summit of that shrine that they were then much extolled, as they have been ever afterwards, and in them Niccolo appears to have surpassed himself, for he never did anything better. In short, they are such that they can stand beside any other work of that kind; wherefore he acquired so great credit that he was thought worthy to be in the number of those who were under consideration for the making of the bronze doors of S. Giovanni, although, when the proof was made, he was left behind, and they were allotted, as it will be said in the proper place, to another. After these labours Niccolo went to Milan, where he was made Overseer of the Works of the Duomo in that city; and there he wrought some things in marble which gave great satisfaction.