The second door north of the Duomo was carved by Niccolo di Piero d'Arezzo, who was still working more than forty years after Tedesco's death; but his best work, for we pass by his Statue of St. Mark in the chapel of the apex of the Duomo, is the little Annunciation over the niche of the St. Matthew of Or San Michele. In his work on the gate of the Duomo, however, he was assisted by his pupil Nanni di Banco, who, born in the fourteenth century, died in 1420; and in his work, and in that of Jacopo della Quercia, a Sienese, and a much greater man, we see the very dawn itself. Nanni di Banco, Vasari tells us, was a man who "inherited a competent patrimony, and one by no means of inferior condition." He goes on to say that Nanni was the pupil of Donatello, and though in any technical sense that seems to be untrue, it may well be that he sought Donato's advice whenever he could, for he seems to have practised his art for love of it, and may well have recognised the genius of Donatello, who probably worked beside him. He too worked at Or San Michele, where he carved the St. Philip, the delightful relief under the St. George of Donatello, the Four Saints, which seem to us so full of the remembrance of antiquity, and the S. Eligius with its beautiful drapery, a little stupid still, or sleepy is it, with the mystery of the Middle Age that after all was but just passing away. Something of this sleepiness seems also to have overtaken the St. Luke, that tired figure in the Duomo; and so it is with a real surprise that we come at last upon the best work of Nanni's life, "the first great living composition of the Renaissances," as Burckhardt says, the Madonna della Cintola over Niccolo d'Arezzo's door of the Duomo. Even with all the work of Ghiberti, of Donatello even, to choose from, that relief of Madonna in an almond-shaped glory, stretching out her hands among the cherubim, with a gesture so eager and so moving to St. Thomas, who kneels before her, remains one of the most beautiful works of that age, and one of the loveliest in all Tuscany.