judgments be valid, it is necessary to see whether the justice has a warrant from the  king so that he may judge, for if he has no warrant what will be done before him will  have no validity, done, so to speak, before one not his proper judge. 1The original  writ ought first to be read and then the writ constituting him a justice; if he has no  such writ at all, or if he has but it is not at hand, he need not be obeyed, unless the  original writ makes mention of his judicial authority.2 Nor is he to be obeyed if an  exception is raised to his jurisdiction, that he was3 subdelegated by one who could  not appoint a judge, as where one justice appoints another under him to decide the  whole cause, [which has no more validity] than if a procurator should appoint a  procurator.4 Nor must he be obeyed when it is excepted against him that, though he  shows his warrant, jurisdiction and cognisance has been transferred to another by  the person who delegated,5 for if one at different times appoints two judges, by  appointing the latter he is taken to have superseded the former. Nor is he to be obeyed  though he has been delegated and has his warrant, if it is excepted against him that  under the pretext of one plea he wishes to take cognisance of others to which his  jurisdiction does not extend, or if when he has jurisdiction in one6 plea, exceeds the  limits of his mandate and extends his jurisdiction to [another] when his office has  ended,7 [or to] matters which follow an assise, after the taking of the assise, as  certification and conviction, when he has no general jurisdiction delegated to him,  as have the justices itinerant in the counties ad omnia placita or chief justices.8
Against the jurisdiction of an inferior justice.
 An exception lies against the jurisdiction of an inferior justice where one jurisdiction  is superior to another, as where one is impleaded as to one and the same thing by one  or several in different courts, as in the court of the lord king and the court of a baron  or of some other of lower rank, in which case the more important hall of justice ought  to be preferred to the less important.9 If in the greater court the tenant shows that  he is impleaded on the same matter in a lesser court, a prohibition will be issued on  the king's behalf forbidding that plea to proceed in the inferior court. And though