Venuleius, Stipulations, Book XV. An attorney instituted proceedings for the production of property, and his adversary was discharged because he did not have possession of it. Then, he having subsequently obtained possession of the same property, the principal brought an action against him to compel him to produce it. Sabinus says that the sureties will not be liable, as this is a different matter; for even if the principal should bring the action in the first place, and, after his adversary had been discharged because he did not have possession of the property, he should bring another, he would not be barred by an exception on the ground of res judicata. 1If an agent has collected money from a debtor, and given him security that his principal will ratify his act, and the latter afterwards brings suit for the same sum of money, and loses the case, the stipulation will become operative; and if the agent pays the same money to his principal without an order of court, it can be recovered by a personal action. Where, however, the debtor brings suit under the stipulation, it may be said that if the principal undertakes the defence of his agent he cannot improperly make use of an exception on the ground of bad faith against the debtor, because the obligation remains a natural one. 2If anyone should permit his status to be disputed by an agent, he should take security from him that he will not continually be molested on this account, and if the principal, or his representatives, does not ratify his act, namely, that the agent attempted to reduce the party in question to slavery; or if the latter obtained a judgment against the agent in favor of his freedom, the entire value of the property must be paid to him when his right to liberty has been established, that is to say, to the extent of his interest in not having his status placed in jeopardy, as well as for the expenses incurred by the litigation. Labeo, however, thinks that a definite sum should be included, because the estimation of freedom is capable of indefinite extent; the stipulation, however, is held to become operative from the very moment when the principal refused to ratify the act of the agent. Still, an action cannot be brought under the stipulation before a judgment has been rendered with reference to the freedom of the alleged slave, because if it should be decided that he was a slave, the stipulation becomes void, and if any action can be brought he is understood to have acquired it for his master.