and partition made, then the sheriff shall have their bodies by this writ.
Writ to produce the bodies of extenders so they may certify.
 1The king to the sheriff, greeting. We order you to have before etc. at such a  place and on such a day, the bodies of A. B. [and] C. and D., extenders of such a  manor, to certify to those persons, our justices, how and in what things and by  what parcels and at what valuation they made that extent, as to which the aforesaid  A. claims they extended to such a one twenty librates of land for ten. And you  are yourself to be there together with the aforesaid extenders to make that certification.  Witness etc. And note that if it can be ascertained that the sheriff has been  negligent, lax or remiss in executing the precepts of the lord king, on his default  let the coroners be ordered to execute them, as [in the roll] of Easter term in the  eighth year of king Henry in the county of Wiltshire, [the case] of Thomas de  Gymeges etc.2 And if they prove negligent, then let the keepers of escheats be  ordered to do so.
The duty of extenders.
 3The office of extenders lies in the extending and valuing of things comprised in an  inheritance; first that they see what and how much there is in demesne in each  manor, that is, how many acres or virgates of arable land and the annual value of  each acre or virgate. Also how many acres there are in pasture and what each is  worth per annum. Also what and how much lies in waste. Also how many acres of  meadow and in what year they may be mowed and in what year not. Also how  many acres of wood and how much they are worth a year, with the pannage  and without it. Also let the gardens be valued and, if there are any, the game  preserves and fish ponds. And in brief all the other things that belong to the corpus  of the manor and from which profit could be derived. Also what and how much  there is in villeinage, how many virgates, and how much they are worth a year in  rents, tallages and all other things. Then let the services and rents of the free  tenants be extended. If there is an advowson, let it be extended and valued together  with the other things comprised in the inheritance, that is, at twelve pence to the  mark according to the value of the church, as where the church is worth a hundred  marks a year according to common estimate, let the advowson be valued
1. Cf. C.R.R., xiv, no. 2480 (Trin. 14, a writ attested by W. de Ralegh): H. Dei gracia etc. vicecomite Surr salutem. Precipimus tibi sicut alias precepimus, quod habeas coram justiciariis nostris apud Westmonasterium in octabis sancti Johannis Baptiste corpora
[names endorsed] extensorum manerii de Gumeshelf ad certificandum eosdem justiciarios nostros de extensione illa qualiter et in quibus et per quas particulas et per quam appreciationem illam fecerunt, unde ballivi W. comitis Marescalli, qui custodiam habet terre W. de Breus, dicunt quod predicti extensores extenderunt Johanni de Breus triginta libratas terre pro viginti. Et tu ipse tunc sis ibi simul cum predictis extensoribus ad certificationem illam faciendam, et habeas ibi hoc breve. Teste W. de Ralegh apud Westmonasterium xviij die Maii anno regni nostri xiiij.
2. B.N.B. no. 1019 (Trin. 8 Hen. III). No roll for Easter 8