Brutus denounces his colleague Collatinus as a traitor:
Tarquinius Superbus, then, lost his throne after tyrannizing over the people for twenty years. The Romans then bent their favor toward Brutus and selected him as their leader. Lest his leadership should look like regal monarchy, they elected Collatinus Tarquinius, the husband of Lucretia, as his co-ruler, because he was known to hate the tyrants due to the rape of his wife. Some ambassadors from Tarquinius came to Rome to discuss terms of his return. They accomplished nothing, but some other ambassadors came from Tarquinius saying that he was willing to abandon his regal title and desist from the war if the Romans would pay to him, his family, and his attendants a sum which would allow them to live comfortably through life in exile. The resolution of many people was swayed by this, including that of Brutus’ colleague Collatinus. Therefore, Brutus ran from the senate house into the forum, and denounced Collatinus as a traitor who delighted in war and the profits of tyranny.
῾Ο μὲν οὖν Ταρκύνιος πέντε καὶ εἴκοσι τυραννήσας ἐνιαυτοὺς οὕτως ἐξέπεσε τῆς ἀρχῆς, οἱ ῾Ρωμαῖοι δὲ πρὸς τὸν Βροῦτον ἀπέκλιναν καὶ αὐτὸν εἵλοντο ἄρχοντα. ἵνα δὲ μὴ ἡ μοναρχία βασιλεία δοκῇ, καὶ συνάρχοντα αὐτῷ ἐψηφίσαντο τὸν τῆς Λουκρητίας ἐκείνης ἄνδρα τὸν Κολλατῖνον Ταρκύνιον, ὡς ἀπεχθῶς πρὸς τοὺς τυράννους πιστευόμενον ἔχειν διὰ τὴν βίαν τῆς γυναικός. ἐκ δέ γε Ταρκυνίου πρέσβεις εἰς ῾Ρώμην ἧκον περὶ καθόδου διαλεγόμενοι· ὡς δ’ οὐδὲν ἤνυον, ἕτεροι αὖθις ἐπέστησαν, ἀφίστασθαι τῆς βασιλείας καὶ παύειν τὸν πόλεμον λέγοντες τὸν Ταρκύνιον, εἰ τὰ χρήματα δοθεῖεν αὐτῷ καὶ τοῖς φίλοις καὶ τοῖς οἰκείοις, ἀφ’ ὧν διαβιώσονται φεύγοντες. ἐπικλωμένων δὲ πολλῶν καὶ αὐτοῦ Κολλατίνου τοῦ τῷ Βρούτῳ συνάρχοντος, εἰς ἀγορὰν ὁ Βροῦτος ἐκ τοῦ βουλευτηρίου ἐξέδραμε, προδότην τὸν Κολλατῖνον ἀποκαλῶν, πολέμου καὶ τυραννίδος ἀφορμὰς χαριζόμενον.