Michaelmas term of the ninth and the beginning of the tenth years of king Henry  in the county of Cambridge, [the case] of a certain record of the abbot of Eynsham.1
 When? It is clear that [the essoin must be cast] on the first day of the suit, for it does  not suffice on the morrow, that is, on the second day, the third or the fourth, though  the person summoned ought to be awaited until the fourth day, that within2 it he  may come or send a messenger to excuse his absence if3 the essoiner does not receive  a day, as where the essoin does not lie, as will be explained below [of defaults].  If the essoin lies for the person summoned, and he causes himself to be essoined4 on  the second or third day, it will be allowed and a day given the essoinee by his essoiner,  on which the default will be allowed the demandant, if he wishes to hold  himself to the default. In that case, if the tenant cannot excuse himself on that day,  he may lose seisin.
 Where? It is clear that the essoin must be cast in court and before his proper judge  and not another, that is,5 before him who has jurisdiction, since a justice other than  one's proper judge has neither jurisdiction nor coercion.6 If he causes himself to be  essoined7 before another, in error, the essoin will be good, but only of grace, to the  extent that the default will be saved until judgment is rendered as to the default; it  can hardly be excused further.
 How often? At every appearance in court, depending upon whether the person  summoned holds by himself or in common, after he has received a day in court,  after the view sought, a warrantor vouched, and after a day given in hope of peace,  or in some other way.8 Generally, always at the beginning of the suit, on every  summons, where there is a controversy or a plea between the parties, [and where  there is a judicial proceeding and one who judges,]9 whether at the outset the  sheriff is ordered to have his body without the formality of attachments, or to cause  him to come, or to distrain him by lands and chattels,10 otherwise it would be  wrongful to the person called to court, [and] to deny him the benefit of the law.  But if there is no plea or judicial proceeding, but someone who orders someone, as  his bailiff, it will be another matter, as above.11
1. B.N.B., no. 1672; C.R.R., xii, nos. 694, 1074: sidelined and De falso iudicio written above entry