While Baccio Ugolini and his colleague were taking part in these deliberations, a revolution was preparing in Italy which altered the whole position of affairs and placed Florence and Milan in quite a different attitude towards the Pope. Sixtus was influenced less by distant apprehensions than by the consideration, to which he could not shut his eyes, that he was helping to strengthen the very power which threatened to become most dangerous to him by its constant endeavours to obtain control over the cities on the Adriatic coast. Giuliano della Rovere—who, twenty years after, as his uncle’s successor, opposed in arms the power of this Republic, his uncle’s old ally—seems to have been the means of finally inducing the Pope to break with Venice. Girolamo Riario, the soul of the war party, might be gained over by a prospect of the Malatesta fiefs. First, a truce was made with the Duke of Calabria, who was still in the Campagna; then, on December 23, peace was agreed upon between the Pope, Naples, Florence, and Milan, with a proviso that Venice was to accede to it. The Florentines were not satisfied with the conditions, and seem to have accused the Milanese of lukewarmness both in regard to the war and to the negotiations. Yet, considering the state of affairs and the losses already sustained, the conditions were not unfavourable. The Duke of Ferrara, who was in the utmost need, was to be reinstated in his possessions. The next point, however, was to persuade or compel the Venetians to accede to the treaty, and thus give reality to the peace, in commemoration of which Sixtus built the church of Sta. Maria della Pace. A congress was to be held at Cremona to regulate everything.