Pope Eugenius being dead, was succeeded by Nicholas V. The count had his whole army at Cotignola, ready to pass into Lombardy, when intelligence was brought him of the death of Filippo, which happened on the last day of August, 1447. This event greatly afflicted him, for he doubted whether his troops were in readiness, on account of their arrears of pay; he feared the Venetians, who were his armed enemies, he having recently forsaken them and taken part with the duke; he was in apprehension from Alfonso, his inveterate foe; he had no hope from the pontiff or the Florentines; for the latter were allies of the Venetians, and he had seized the territories of the former. However, he resolved to face his fortune and be guided by circumstances; for it often happens, that when engaged in business valuable ideas are suggested, which in a state of inaction would never have occurred. He had great hopes, that if the Milanese were disposed to defend themselves against the ambition of the Venetians, they could make use of no other power but his. Therefore, he proceeded confidently into the Bolognese territory, thence to Modena and Reggio, halted with his forces upon the Lenza, and sent to offer his services at Milan. On the death of the duke, part of the Milanese were inclined to establish a republic; others wished to choose a prince, and of these, one part favored the count, and another Alfonso. However, the majority being in favor of freedom, they prevailed over the rest, and organized a republic, to which many cities of the Duchy refused obedience; for they, too, desired to live in the enjoyment of their liberty, and even those who did not embrace such views, refused to submit to the sovereignty of the Milanese. Lodi and Piacenza surrendered themselves to the Venetians; Pavia and Parma became free. This confused state of things being known to the count, he proceeded to Cremona, where his ambassadors and those of the Milanese arranged for him to command the forces of the new republic, with the same remuneration he had received from the duke at the time of his decease. To this they added the possession of Brescia, until Verona was recovered, when he should have that city and restore Brescia to the Milanese.
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, and occupied many fortresses in that territory. Thence he proceeded toward Pisa, and with the assistance of Fazio and Arrigo de'
