Plutarch, Brutus
Bernadotte Perrin, Ed.

27. But as he was about to cross into Asia, tidings came to him of the change that had taken place at Rome. For Octavius Caesar had been strengthened by the senate against Antony, and after ejecting his rival from Italy, was himself now an object of fear, soliciting the consulship illegally, and maintaining large armies, of which the city had no need. [2] But when he saw that even the senate was displeased at this and turned their eyes abroad to Brutus, confirming him in command of his provinces by their vote, he became afraid. So he sent and invited Antony to become his friend, and then, stationing his forces about the city, secured the consulship, although he was still a mere youth, being in his twentieth year, as he himself has stated in his Commentaries. [3] Straightway, then, he brought indictments for murder against Brutus and his associates, accusing them of having slain the first magistrate of the city without a trial. He appointed Lucius Cornificius to be prosecutor of Brutus, and Marcus Agrippa of Cassius. Accordingly, their cases went by default, the jurors voting under compulsion. [4] And it is said that when the herald on the rostra pronounced the customary summons for Brutus to appear, the multitude groaned audibly, while the better classes bowed their heads in silence; and that Publius Silicius was seen to burst into tears, and was for this reason soon afterwards put on the list of the proscribed. [5] After this, the three men, Octavius, Antony, and Lepidus, were reconciled with one another distributed the provinces among themselves, and sentenced to death by proscription two hundred men. Among those put to death was Cicero.