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 send 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.