Origin of the animosity between Sixtus IV. and Lorenzo de’ Medici — Carlo di Braccio da Perugia attacks the Siennese — Carlo retires by desire of the Florentines — Conspiracy against Galeazzo, duke of Milan — His vices — He is slain by the conspirators — Their deaths.

The pope, anxious to retain the territories of the church in obedience, had caused Spoleto to be sacked for having, through internal factions, fallen into rebellion. Citta di Castello being in the same state of contumacy, he besieged that place; and Niccolo Vitelli its prince, being on intimate terms with Lorenzo de’ Medici, obtained assistance from him, which, though inadequate, was quite enough to originate that enmity between Sixtus IV. and the Medici afterward productive of such unhappy results. Nor would this have been so long in development had not the death of Frate Piero, cardinal of St. Sixtus, taken place; who, after having traveled over Italy and visited Venice and Milan (under the pretense of doing honor to the marriage of Ercole, marquis of Ferrara), went about sounding the minds of the princes, to learn how they were disposed toward the Florentines. But upon his return he died, not without suspicion of having been poisoned by the Venetians, who found they would have reason to fear Sixtus if he were allowed to avail himself of the talents and exertions of Frate Piero. Although of very low extraction, and meanly brought up within the walls of a convent, he had no sooner attained the distinction of the scarlet hat, than he exhibited such inordinate pride and ambition, that the pontificate seemed too little for him, and he gave a feast in Rome which would have seemed extraordinary even for a king, the expense exceeding twenty thousand florins. Deprived of this minister, the designs of Sixtus proceeded with less promptitude. The Florentines, the duke, and the Venetians having renewed their league, and allowed the pope and the king to join them if they thought proper, the two latter also entered into a league, reserving an opening for the others if they were desirous to become parties to it. Italy was thus divided in two factions; for circumstances daily arose which occasioned ill feeling between the two leagues; as occurred with respect to the island of Cyprus, to which Ferrando laid claim, and the Venetians occupied. Thus the pope and the king became more closely united. Federigo, prince of Urbino, was at this time one of the first generals of Italy; and had long served the Florentines. In order, if possible, to deprive the hostile league of their captain, the pope advised, and the king requested him to pay a visit to them. To the surprise and displeasure of the Florentines, Federigo complied; for they thought the same fate awaited him as had befallen Niccolo Piccinino. However, the result was quite different; for he returned from Naples and Rome greatly honored, and with the appointment of general to their forces. They also endeavored to gain over to their interest the lords of Romagna and the Siennese, that they might more easily injure the Florentines, who, becoming aware of these things, used their utmost endeavors to defend themselves against the ambition of their enemies; and having lost Federigo d’Urbino, they engaged Roberto da Rimino in his place, renewed the league with the Perugini and formed one with the prince of Faenza. The pope and the king assigned, as the reasons of their animosity against the Florentines, that they wished to withdraw them from the Venetian alliance, and associate them with their own league; for the pope did not think the church could maintain her reputation, nor the Count Girolamo retain the states of Romagna, while the Florentines and the Venetians remained united. The Florentines conjectured their design was to set them at enmity with the Venetians, not so much for the sake of gaining their friendship as to be able the more easily to injure them. Two years passed away in these jealousies and discontents before any disturbance broke out; but the first which occurred, and that but trivial, took place in Tuscany.

Braccio of Perugia, whom we have frequently mentioned as one of the most distinguished warriors of Italy, left two sons, Oddo and Carlo; the latter was of tender years; the former, as above related, was slain by the people of Val di Lamona; but Carlo, when he came to mature age, was by the Venetians, out of respect for the memory of his father, and the hopes they entertained from himself, received among the condottieri of their republic. The term of his engagement having expired, he did not design to renew it immediately, but resolved to try if, by his own influence and his father’s reputation, he could recover possession of Perugia. To this the Venetians willingly consented, for they usually extended their dominion by any changes that occurred in the neighboring states. Carlo consequently came into Tuscany, but found more difficulties in his attempt upon Perugia than he had anticipated, on account of its being allied with the Florentines; and desirous of doing something worthy of memory, he made war upon the Siennese, alleging them to be indebted to him for services performed by his father in the affairs of that republic, and attacked them with such impetuosity as to threaten the total overthrow of their dominion. The Siennese, ever ready to suspect the Florentines, persuaded themselves that this outrage had been committed with their cognizance, and made heavy complaints to the pope and the king against them. They also sent ambassadors to Florence to complain of the injuries they had suffered, and adroitly intimated, that if Carlo had not been secretly supported he could not have made war upon them with such perfect security. The Florentines denied all participation in the proceedings of Carlo, expressed their most earnest wish to do everything in their power to put a stop to them, and allowed the ambassadors to use whatever terms they pleased in the name of the Signory, to command him to desist. Carlo complained that the Florentines, by their unwillingness to support him, had deprived themselves of a most valuable acquisition and him of great glory; for he could have insured them the possession of the whole territory in a short time, from the want of courage in the people and the ineffectual provision they had made for their defense. He then withdrew to his engagement under the Venetians; but the Siennese, although delivered from such imminent peril by the Florentines, were still very indignant against them; considering themselves under no obligation to those who had delivered them from an evil to which they had first exposed them.

While the transactions between the king and the pope were in progress, and those in Tuscany in the manner we have related, an event of greater importance occurred in Lombardy. Cola Montano, a learned and ambitious man, taught the Latin language to the youth of the principal families in Milan. Either out of hatred to the character and manners of the duke, or from some other cause, he constantly deprecated the condition of those who live under a bad prince; calling those glorious and happy who had the good fortune to be born and live in a republic. He endeavored to show that the most celebrated men had been produced in republics, and not reared under princes; that the former cherish virtue, while the latter destroy it; the one deriving advantage from virtuous men, while the latter naturally fear them. The youths with whom he was most intimate were Giovanni Andrea Lampognano, Carlo Visconti, and Girolamo Ogliato. He frequently discussed with them the faults of their prince, and the wretched condition of those who were subject to him; and by constantly inculcating his principles, acquired such an ascendancy over their minds as to induce them to bind themselves by oath to effect the duke’s destruction, as soon as they became old enough to attempt it. Their minds being fully occupied with this design, which grew with their years, the duke’s conduct and their own private injuries served to hasten its execution. Galeazzo was licentious and cruel, of both which vices he had given such repeated proofs, that he became odious to all. Not content with corrupting the wives of the nobility, he also took pleasure in making it notorious; nor was he satisfied with murdering individuals unless he effected their deaths by some unusual cruelty. He was suspected of having destroyed his own mother; for, not ............