Now Valerius was troubled that his desire to serve his country should be doubted, because he had sustained no private injury from the insolence of the tyrants. He withdrew from the senate and practice of the bar, quitting all public concerns; which gave an occasion of discourse, and fear, too, lest his anger should reconcile him to the king's side, and he should prove the ruin of the state, tottering as yet under the uncertainties of a change. But Brutus being doubtful of some others, and determined to give the test to the senate upon the altars, upon the day appointed Valerius came with cheerfulness into the forum, and was the first man that took the oath, in no way to submit or yield to Tarquin's propositions, but rigorously to maintain liberty; which gave great satisfaction to the senate and assurance to the consuls, his action soon after showing the sincerity of his oath. For ambassadors came from Tarquin, with popular and specious proposals, whereby they thought to seduce the people, as though the king had cast off all insolence, and made moderation the only measure of his desires. To this embassy the consuls thought fit to give public audience, but Valerius opposed it, and would not permit that the poorer people, who entertained more fear of war than of tyranny, should have any occasion offered them, or any temptations to new designs. Afterwards other ambassadors arrived, who declared their king would recede from his crown, and lay down his arms, only capitulating for a restitution to himself, his friends, and allies, of their moneys and estates to support them in their banishment. Now, several inclining to the request, and Collatinus in particular favouring it, Brutus, a man of vehement and unbending nature, rushed into the forum, there proclaiming his fellow-consul to be a traitor, in granting subsidies to tyranny, and supplies for a war to those to whom it was monstrous to allow so much as subsistence in exile. This caused an assembly of the citizens, amongst whom the first that spake was Caius Minucius, a private man, who advised Brutus, and urged the Romans to keep the property, and employ it against the tyrants, rather than to remit it to the tyrants, to be used against themselves.
The Romans, however, decided that whilst they had enjoyed the liberty they had fought for, they should not sacrifice peace for the sake of money, but send out the tyrants' property after them. This question, however, of his property was the least part of Tarquin's design; the demand sounded the feelings of the people, and was preparatory to a conspiracy which the ambassadors endeavoured to excite, delaying their return, under pretence of selling some of the goods and reserving others to be sent away, till, in fine, they corrupted two of the most eminent families in Rome, the Aquillian, which had three, and the Vitellian, which had two senators. These all were, by the mother's side, nephews to Collatinus; besides which Brutus had a special alliance to the Vitellii from his marriage with their sister, by whom he had several children; two of whom, of their own age, their near relations and daily companions, the Vitellii seduced to join in the plot, to ally themselves to the great house and royal hopes of the Tarquins, and gain emancipation from the violence and imbecility united of their father, whose austerity to offenders they termed violence, while the imbecility which he had long feigned, to protect himself from the tyrants, still, it appears, was, in name at least, ascribed to him. When upon these inducements the youths came to confer with the Aquillii, and thought it convenient to bind themselves in a solemn and dreadful oath, by tasting the blood of a murdered man, and touching his entrails. For which design they met at the house of the Aquillii. The building chosen for the transaction was, as was natural, dark and unfrequented, and a slave named Vindicius had, as it chanced, concealed himself there, not out of design or any intelligence of the affair, but, accidentally being within, seeing with how much haste and concern they came in, he was afraid to be discovered, and placed himself behind a chest, where he was able to observe their actions and overhear their debates. Their resolutions were to kill the consuls, and they wrote letters to Tarquin to this effect, and gave them to the ambassadors, who were lodging upon the spot with the Aquillii, and were present at the consultation.