because if, when the tenant raised two peremptory exceptions, or several, and failed  in the proof of one, he could have recourse to the others and prove them, he could thus  defend himself with several staves, which ought not to be, since one alone ought to  suffice him.
An exception may be proved in many ways.
 An exception may be proved in many ways, by the voice of the dead, as by documents,  as well as by that of the living, as by the country and by inquests, not by  members of one's household, and servants, or persons suspect for some other reason,  but by those connected by affinity with neither party.
Not by suit.
 Not by suit, which may be made by servants and members of one's household, for suit  does not constitute proof but raises a slight presumption, which is destroyed by proof  to the contrary and by wager of law.
Not by a single voice.
 Not by the voice of a single person, for such does not constitute proof nor does it  raise a presumption. If one fails in the proof of an exception or a replication or others  beyond, he will lose by judgment.
First of the exception raised against the jurisdiction.
 First let us speak of an exception common to all actions, namely, that raised against  the jurisdiction. Jurisdiction is nothing other than having the authority, ordinary or  delegated, to do justice between the parties in actions touching persons and things  which1 are brought in court, of which we have spoken above [of the power of judges.]2
What jurisdiction is and how is it divided.
 There is one jurisdiction, ordinary or delegated, which pertains to the priesthood and  the ecclesiastical forum, as in spiritual causes and those annexed to a spirituality, and  another, ordinary or delegated, which pertains to the crown and dignity of the king  and to the realm, in causes and pleas touching temporal things in the secular forum.3  Thus we must see to whose court and forum the actor ought to go.4 It is [generally]  true that whether one wishes to sue a layman or a clerk, he ought to go to the judge  and follow the forum of the reus,5 and he will have the judge at the place where the  reus has his domicile,6 whether he has that within the jurisdiction of one judge or of  two.7