Plutarch, Publicola
Bernadotte Perrin, Ed.

18. Publicola himself, moreover, thinking that Porsena would be more valuable as a friend and ally of time city than he was dangerous as its enemy, did not shrink from making the king an arbitrator in his dispute with Tarquin but often boldly challenged Tarquin to do so, confident of proving that he was the basest of men and justly deprived of his kingdom. And when Tarquin gave him a rough answer, saying that he would make no man his judge, least of all Porsena, [2] seeing that he was swerving from his alliance with him, Porsena was displeased and perceived the weakness of his cause. His son Aruns also pleaded earnestly with him in behalf of the Romans. Consequently, he put an end to his war against them, on condition that they gave up the territory of Tuscany which they had taken, sent back their prisoners of war, and received back their deserters. In confirmation of these conditions, the Romans gave as hostages ten young men from their noblest families, and as many maidens, of whom Valeria, a daughter of Publicola, was one.