It has a grim square fortalice above it, now in ruins, and a stately castle to the south-east, built about the time of Braccio. Here took place that famous diet of Cesare Borgia's enemies, when the son of Alexander VI. was threatening Bologna with his arms, and bidding fair to make himself supreme tyrant of Italy in 1502. It was the policy of Cesare to fortify himself by reducing the fiefs of the Church to submission, and by rooting out the dynasties which had acquired a sort of tyranny in Papal cities. The Varani of Camerino and the Manfredi of Faenza had been already extirpated. There was only too good reason to believe that the turn of the Vitelli at Città di Castello, of the Baglioni at Perugia, and of the Bentivogli at Bologna would come next. Pandolfo Petrucci at Siena, surrounded on all sides by Cesare's conquests, and specially menaced by the fortification of Piombino, felt himself in danger. The great house of the Orsini, who swayed a large part of the Patrimony of S. Peter's, and were closely allied to the Vitelli, had even graver cause for anxiety. But such was the system of Italian warfare, that nearly all these noble families lived by the profession of arms, and most of them were in the pay of Cesare. When, therefore, the conspirators met at La Magione, they were plotting against a man whose money they had taken, and whom they had hitherto aided in his career of fraud and spoliation. The diet consisted of the Cardinal Orsini, an avowed antagonist of Alexander VI.; his brother Paolo, the chieftain of the clan; Vitellozzo Vitelli, lord of Città di Castello; Gian-Paolo Baglioni, made undisputed master of Perugia by the recent failure of his cousin Grifonetto's treason; Oliverotto, who had just acquired the March of Fermo by the murder of his uncle Giovanni da Fogliani; Ermes Bentivoglio, the heir of Bologna; and Antonio da Venafro, the secretary of Pandolfo Petrueci. These men vowed hostility on the basis of common injuries and common fear against the Borgia. But they were for the most part stained themselves with crime, and dared not trust each other, and could not gain the confidence of any respectable power in Italy except the exiled Duke of Urbino. Procrastination was the first weapon used by the wily Cesare, who trusted that time would sow among his rebel captains suspicion and dissension. He next made overtures to the leaders separately, and so far succeeded in his perfidious policy as to draw Vitellozzo Vitelli, Oliverotto da Fermo, Paolo Orsini, and Francesco Orsini, Duke of Gravina, into his nets at Sinigaglia. Under pretext of fair conference and equitable settlement of disputed claims, he possessed himself of their persons, and had them strangled--two upon December 31, and two upon January 18, 1503. Of all Cesare's actions, this was the most splendid for its successful combination of sagacity and policy in the hour of peril, of persuasive diplomacy, and of ruthless decision when the time to strike his blow arrived.