Caesar and Pompeys's measures, whereupon Cicero made an oration urging Cato to soften his attitude. According to Plutarch, Finally Cato was persuaded to give up his opposition, followed by Favonius, the last to submit. Plutarch writes, "By these and similar arguments and entreaties, we are told, both at home and in the forum, Cato was softened and at last prevailed upon. He came forward to take the oath last of all, except Favonius, one of his friends and intimates." Upon hearing the news that of the members of the Triumvirate, Caesar was to be given a fresh supply of money, and Pompey and Crassus were to be consuls again the following year, Favonius, "when he found he could do no good by opposing it, broke out of the house, and loudly declaimed against these proceedings to the people, but none gave him any hearing; some slighting him out of respect to Crassus and Pompey, and the greater part to gratify Caesar, on whom depended their hopes". Assassination of Caesar Despite the fact that he opposed Caesar, Favonius, like Cicero, was not invited by Brutus and Cassius to participate in the plot to assassinate Caesar in 44 BC. In his Life of Brutus, Plutarch wrote, Execution after Philippi After Caesar's death in March 44 BC, Favonius became an opponent of his successors in the Second Triumvirate. According to Cicero's letter to Atticus of 8 June 44 BC, Favonius was present at a meeting of the Liberatores who opposed Antony's near-dictatorial regime. Also present at this meeting were Cicero, Brutus, Cassius, Porcia Catonis, Servilia and Junia Tertia. Along with Cicero, his brother Quintus Tullius Cicero, and Lucius Julius Caesar, Favonius was proscribed by the triumvirate, and imprisoned after Antony and Octavian (later Augustus) defeated the forces of Brutus and Cassius at the Battle of Philippi (42 BC). His imprisonment did little to assuage his intemperate behaviour. According to Suetonius, "Marcus Favonius, the well-known imitator of Cato, saluted Antonius respectfully as Imperator when they were led out in chains, but lashed Augustus to his face with the foulest abuse." Favonius' abuse was apparently as a result of Octavian's brutal treatment of the prisoners captured at Philippi. Of his death Cassius Dio wrote, Favonius' slave Sarmentus, who was bought after his master's death when his estate was sold, is claimed to have become a catamite of the emperor Augustus. Modern-day historian Josiah Osgood says