For Quintus Roscius the Actor (54)

But if any one can make a claim on behalf of another, who is not appointed his agent, I ask why then, when Panurgus was slain, and an action was commenced against Fannius on the plea of injury sustained by the loss, you were made the agent of Roscius for that action? especially when, according to what you now say, whatever claim you made for yourself you made for him; whatever recompense you exacted for yourself, would belong to the partnership. But if nothing would have come to Roscius which you had got from Flavius, unless he had appointed you agent for his action, so nothing ought to come to you which Roscius has exacted for his share, since he was not appointed your agent.