Meanwhile Jacopo had heard that the Guild of the Merchants of Calimara in Florence wished to have a bronze door made for the Church of S. Giovanni, where, as it has been said, Andrea Pisano had wrought the first; and he had come to Florence in order to make himself known, above all because this work was to be allotted to the man who, in making one of those scenes in bronze, should give the best proof of himself and of his talent. Having therefore come to Florence, he not only made the model, but delivered one very well executed scene, completely finished and polished, which gave so great satisfaction, that, if he had not had as rivals those most excellent masters, Donatello and Filippo Brunelleschi, who in truth surpassed him in their specimens, it would have fallen to him to make this work of so great importance. But the business having concluded otherwise, he went to Bologna, where, by the favour of Giovanni Bentivogli, he was commissioned by the Wardens of Works of S. Petronio to make in marble the principal door of that church, which he continued in the German manner, in order not to alter the style wherein it had already been begun, filling up what was lacking in the design of the pilasters that support the cornice and the arch, with scenes wrought with infinite love within the space of the twelve years that he was engaged in this work, wherein he made with his own hand all the foliage and ornamentation of the said door, with the greatest diligence and care that he could command. On each of the pilasters that support the architrave, the cornice, and the arch, there are five scenes, and five on the architrave, making fifteen in all; and in them all he carved in low-relief stories from the Old Testament--namely, from the Creation of man by God up to the Deluge and Noah's Ark, thus conferring very great benefit on sculpture, since from the ancients up to that time there had been no one who had wrought anything in low-relief, wherefore that method of working was rather out of mind than out of fashion. In the arch of this door he made three figures in marble, as large as life and all in the round--namely, a very beautiful Madonna with the Child in her arms, S. Petronius, and another Saint, all very well grouped and in beautiful attitudes; wherefore the people of Bologna, who did not think that there could be made a work in marble, I do not say surpassing, but even equalling that one which Agostino and Agnolo of Siena had made in the ancient manner on the high-altar of S. Francesco in their city, were amazed to see that this one was by a great measure more beautiful.