Entry from "A Florentine Diary" by Luca Landucci:
The king left Florence after having dined, and went for the night to the Certosa, and all his men went before or after him, so that few remained here. It was said that Fra Girolamo of Ferrara, our famous preacher, had gone to the king and declared that he was not doing the will of God in stopping, and that he ought to leave. It was even said that he went a second time, when he saw that the king did not leave, and declared again that he was not following God's will, and that whatever evil should befall others would return on his head. It was thought that this was the cause of his leaving more speedily, because at that time the said Fra Girolamo was held to be a prophet and a man of holy life, both in Florence and throughout Italy. At the same time there came to Florence the captain of the French troops in Romagna, whose name was Begni,(1) and he told the king rather dictatorially that he ought to leave on every account, as the weather was favourable, and he declared that it would be ill to delay the advance. And in fact the king did leave, for he put more faith in this seigneur than in all the rest, and deservedly, as he was an extremely intelligent and worthy man, according to what was said; and this was in reality the strongest reason which induced him to leave.(2)
(1) Robert Stuart, Comte de Beaumont le Roger, Seigneur of Aubigny-sur-Nerre.
(2) On this day the Signori designed Guglielmo d'Antonio Pazzi, Braccio di Domenico Martelli, Niccolo Antinori, and Lorenzo di Pier Francesco de' Medici to go the following morning and accompany the king as far as Siena. Afterwards they substituted Francesco de' Rossi for the Medici.
Landucci, Luca, trans. Alice de Rosen Jervis, J.M. Dent & Sons, 1927. "A Florentine Diary", p. 72