From
SN4086 Peasant Land Market in Southern England, 1260-1350:
1313 Bishops Waltham, Hampshire: Nigel ate Cruche paid 6/8d for a messuage and one third of a ferling in Uph'm (Upham) previously held by his father Geoffrey ate Cruche.
1319 Bishops Waltham, Hampshire: Alice atte Crouche' paid 10/- to retain a messuage and one third of a ferling in Uph'm (Upham) previously held by her deceased husband Nigel.
A messuage is a dwelling house and legal rights such as access to commons etc.
A ferling is a quarter of a parcel of land.