Before the duke’s death, Pope Nicholas, after his assumption of the pontificate, sought to restore peace among the princes of Italy, and with this object endeavored, in conjunction with the ambassadors sent by the Florentines to congratulate him on his accession, to appoint a diet at Ferrara to attempt either the arrangement of a long truce, or the establishment of peace.  A congress was accordingly held in that city, of the pope’s legate and the Venetian, ducal, and Florentine representatives.  King Alfonso had no envoy there.  He was at Tivoli with a great body of horse and foot, and favorable to the duke; both having resolved, that having gained the count over to their side, they would openly attack the Florentines and Venetians, and till the arrival of the count in Lombardy, take part in the treaty for peace at Ferrara, at which, though the king did not appear, he engaged to concur in whatever course the duke should adopt.  The conference lasted several days, and after many debates, resolved on either a truce for five years, or a permanent peace, whichsoever the duke should approve; and the ducal ambassadors, having returned to Milan to learn his decision, found him dead.  Notwithstanding this, the Milanese were disposed to adopt the resolutions of the assembly, but the Venetians refused, indulging great hopes of becoming masters of Lombardy, particularly as Lodi and Piacenza, immediately after the duke’s death, had submitted to them.  They trusted that either by force or by treaty they could strip Milan of her power; and then so press her, as to compel her also to surrender before any assistance could arrive; and they were the more confident of this from seeing the Florentines involved in war with King Alfonso.

The king being at Tivoli, and designing to pursue his enterprise against Tuscany, as had been arranged between himself and Filippo, judging that the war now commenced in Lombardy would give him both time and opportunity, and wishing to have a footing in the Florentine state before he openly commenced hostilities, opened a secret understanding with the fortress of Cennina, in the Val d’Arno Superiore, and took possession of it.  The Florentines, surprised with this unexpected event, perceiving the king already in action, and resolved to do them all the injury in his power, hired forces, created a council of ten for management of the war, and prepared for the conflict in their usual manner.  The king was already in the Siennese, and used his utmost endeavors to reduce the city, but the inhabitants of Sienna were firm in their attachment to the Florentines, and refused to receive him within their walls or into any of their territories.  They furnished him with provisions, alleging in excuse, the enemy’s power and their inability to resist.  The king, finding he could not enter by the Val d’Arno, as he had first intended, both because Cennina had been already retaken, and because the Florentines were now in some measure prepared for their defense, turned toward Volterra,