The farthing-land, 1/2 obolata terræ, was 1 rood.
Cent livrées de terre à l’esterlin (Froissart) a hundred pound-lands, reckoned of the annual value of 100 pounds sterling. This is sometimes taken as the amount of ‘relief,’ another feudal estimate, often taken at one year’s value.
In Edward I’s time a son and heir paid £18 for relief of his land which was worth £18 a year. In Henry II’s time £5 appears to be the usual relief paid for a knight’s fee on succession to it. By Magna Charta the relief of a whole barony (10 to 40 knight’s fees) was fixed at 100 marks; in Henry III’s time it was £100.
I may here give a fifteenth-century record of English linear measures.[[17]]
Nota, for to mesure and mete lande.
It is to mete that iij Early Cornys in the myddis of the Ere makyth one ynche, And xij enchis makyth a foote
And sixteyne foote and a halfe makyth a perche; And in sum cuntre a perche ys xviij foote.
Fourty perchys in lengyth makyth a Rode of Lande; put iiij therto in brede, and that makyth an Acre.
And xiiij Acrys makyth a yerde of lande;
And v yerdis makyth an hyde of lande, which ys lxx Acrys.