may be had as to the presentation and the person of the presentor.1 If certainty may  still not be reached, let recourse be had to predecessors as far back as time permits  the assise to go, and when it can proceed no further, let recourse then first be had to  the property and the writ of right,2 that by it the property may be determined, and  the assise. If the jurors do not know whether he or his ancestor presented, or another,  or who, by a finding of that kind the plaintiff will obtain nothing,3 having failed, so  to speak, in his proof, for so long as there is doubt whether something exists it is as  though it did not exist. And so [if] they do not know the plaintiff at all, or though they  know him do not know whether he ever presented, or whether he is the son and heir  of him who last presented, whose seisin he claims, and consequently cannot know  whether the action or plaint belongs to him. But if these matters are known, it may  easily be determined for whom judgment will be given by the assise.
When both parties appear in court let the plaintiff present his claim.
 When both are present and the deforciant wishes to oppose the assise.4 After the  writ has been heard, the plaintiff must first support his intentio in this way:5[The  intentio and narratio ought to be certain, and the foundation of it certain, and certain  the thing brought before the court, and there ought to be real proof for the demandant  or plaintiff, or at least a presumption, which will always stand until, by excepting  and proving his exception, the tenant or deforciant establishes the contrary.]6He  ought to show on whose seisin he brings the assise, whether on his own [or that of an  ancestor. If on his own,] how he holds, in fee, for life or for a term, the corporeal thing  to which the advowson is appurtenant, or the advowson itself, that is, the right of  advowson without the thing or body to which it adheres. If on the seisin of some  ancestor, he must show that he is the heir of the ancestor whose seisin he claims,  either separately and by himself, without others, or with others, in common and  without separation, [where several are, so to speak, a single heir, all must be named,]  or in common and7 separately and successively, in which case it suffices if he sues to  whom the presentation belongs on this occasion, or where the right to present on the  seisin of a single ancestor