or because the lord has no court.] not to superior chief lords but only to the county,  since the writ states that if the person named does not do it that the sheriff may immediately  take it in hand. Also because of the lack of authority of the chief lord, as  where a warrantor is vouched who is resident outside his potestas, or perhaps the deforciant  has essoined himself of bed-sickness outside his lord's potestas, so that, though  [he is] lord, he cannot send knights. [The king sometimes does this by his writ.] Also  where the tenant has put himself on the grand assise. And there are an infinite number  of other causes. If the chief lord begins to hold the plea and then dies, though his heir  is within age the writ does not fall on that account, because the court will judge. I am  unwilling to put into this tractate [a discussion] of the issuing of summonses to the  court of the chief lord, how many there ought to be, and how many defaults or essoins,  because of the different customs which are differently observed in different courts.  But it is clear that in claiming the view and sometimes in vouching to warranty, in  putting forward exceptions and waging duels, and in all other matters which can and  ought to be determined in the courts of lords, the [practices] observed in the royal  court ought to be followed.1
How the default of a court may be proved.
 When the chief lord is unwilling or unable to do right and his court has thus failed of  right, we must see how the default ought to be proved, so that the plea may be transferred  to the county court, and then, when the suit begins to be in the county, up to  what time the chief lord may claim his court, since he perhaps has not failed of right.  2After the default of the chief lord's court, let the demandant go at once to the county  court and there show that his lord's court has failed to do him right. Proof of the  default having been waged in the hand of the king's serjeant, according to some, let  the sheriff instruct the serjeant to go at once, taking with him honest and lawful men,  to the court of that chief lord, [if he has and holds a court, or if he has no court, to  the place where he has his residence, provided that is in the same fee as the land  claimed. If he holds no court and has no residence, it then suffices if the demandant  proves the default at any place on that fee, according as the lord has the choice of  holding his court wherever he wishes on his fee, since he cannot dejure hold it outside.]  and see if the court has failed to do the demandant right.