At the same time he had abundant energy for the prosecution of the feuds in which he soon found himself engaged with the Florentine scholars. So great was the arrogance displayed by Filelfo, his meanness in private life, and his imprudence in public,[264] that even the men who had invited him became his bitter foes. Niccolo de' Niccoli, always jealous of superiority, and apt to take offence, was the first with whom he quarrelled; then followed Carlo Marsuppini and Ambrogio Traversari, until at last the whole of the Medicean party were inflamed against him. Filelfo on his side spared neither satires nor slanders; and when the political crisis, which for a time depressed the Medicean faction, was impending, he declared himself the public opponent of Cosimo. Already in the spring of 1433 he had been stabbed in the face while walking to the University one morning by Filippo, a cut-throat from Casale; nor does there seem any reason to doubt that, as Filelfo himself firmly believed, the man was paid to kill him by the Medici. When the same bravo afterwards followed him to Siena,[265] Filelfo hired a Greek, by name Antonio Maria, to retaliate upon his foes in Florence. It is not probable that a merely literary quarrel would have run to these extremities. Even the foulness of Poggio's invectives and the fury of Filelfo's satires fail to account for the intervention of assassins. We know, however, that Filelfo had not confined himself to calumnies and criticisms of his literary rivals. During Cosimo's imprisonment he urged the Signory in open terms to take his life; when he was living in exile at Venice, he pursued him with abominable slanders; and now, on Cosimo's return, though himself expelled from the city as a rebel and a proscript, he kept stirring up the burghers of Florence and the Courts of Italy against the tyrant.[266] [Footnote 264: See Rosmini, vol. i. pp. 43, 48.] [Footnote 265: _Ibid._ vol. i. p. 83, for the trial, torture, and confession of this bravo.]