While these works were being executed by Tribolo in Florence, M. Bartolommeo Barbazzi, a Bolognese gentleman who had gone there on some business, remembered that a search was being made in Bologna for a young man who could work well, to the end that he might be set to making figures and scenes of marble for the façade of S. Petronio, the principal church of that city. Wherefore he spoke to Tribolo, and having seen some of his works, which pleased him, as also did the young man's ways and other qualities, he took him to Bologna, where Tribolo, with great diligence and with much credit to himself, in a short time made the two Sibyls of marble that were afterwards placed in the ornament of that door of S. Petronio which leads to the Della Morte Hospital. These works finished, arrangements were being made to give him greater things to do, and he was receiving many proofs of love and affection from M. Bartolommeo, when the plague of the year 1525 began in Bologna and throughout all Lombardy; whereupon Tribolo, in order to avoid that plague, made his way to Florence. After living there during all the time that this contagious and pestilential sickness lasted, he departed as soon as it had ceased, and returned, in obedience to a summons, to Bologna, where M. Bartolommeo, not allowing him to set his hand to any work for the façade, resolved, seeing that many of his friends and relatives had died, to have a tomb made for himself and for them. And so Tribolo, after finishing the model, which M. Bartolommeo insisted on seeing completed before he did anything else, went in person to Carrara to have the marbles excavated, intending to rough-hew them on the spot and to lighten them in such a manner, that they might not only be easier to transport, as indeed they were, but also that the figures might come out larger. In that place, in order not to waste his time, he blocked out two large children of marble, which were taken to Bologna with beasts of burden, unfinished as they were, together with the rest of the work; and after the death of M. Bartolommeo, which caused such grief to Tribolo that he returned to Tuscany, they were placed, with the other marbles, in a chapel in S. Petronio, where they still are.