The Duke Valentino had returned from Lombardy, where he had been to clear himself with the King of France from the calumnies which had been raised against him by the Florentines concerning the rebellion of Arezzo and other towns in the Val di Chiana, and had arrived at Imola, whence he intended with his army to enter upon the campaign against Giovanni Bentivogli, the tyrant of Bologna: for he intended to bring that city under his domination, and to make it the head of his Romagnian duchy. These matters coming to the knowledge of the Vitelli and Orsini and their following, it appeared to them that the duke would become too powerful, and it was feared that, having seized Bologna, he would seek to destroy them in order that he might become supreme in Italy. Upon this a meeting was called at Magione in the district of Perugia, to which came the cardinal, Pagolo, and the Duke di Gravina Orsini, Vitellozzo Vitelli, Oliverotto da Fermo, Gianpagolo Baglioni, the tyrant of Perugia, and Messer Antonio da Venafro, sent by Pandolfo Petrucci, the Prince of Siena. Here were discussed the power and courage of the duke and the necessity of curbing his ambitions, which might otherwise bring danger to the rest of being ruined. And they decided not to abandon the Bentivogli, but to strive to win over the Florentines; and they sent their men to one place and another, promising to one party assistance and to another encouragement to unite with them against the common enemy. This meeting was at once reported throughout all Italy, and those who were discontented under the duke, among whom were the people of Urbino, took hope of effecting a revolution. Thus it arose that, men’s minds being thus unsettled, it was decided by certain men of Urbino to seize the fortress of San Leo, which was held for the duke, and which they captured by the following means. The castellan was fortifying the rock and causing timber to be taken there; so the conspirators watched, and when certain beams which were being carried to the rock were upon the bridge, so that it was prevented from being drawn up by those inside, they took the opportunity of leaping upon the bridge and thence into the fortress. Upon this capture being effected, the whole state rebelled and recalled the old duke, being encouraged in this, not so much by the capture of the fort, as by the Diet at Magione, from whom they expected to get assistance. Those who heard of the rebellion at Urbino thought they would not lose the opportunity, and at once assembled their men so as to take any town, should any remain in the hands of the duke in that state; and they sent again to Florence to beg that republic to join with them in destroying the common firebrand, showing that the risk was lessened and that they ought not to wait for another opportunity.