The hide was the principal unit of assessment in the Anglo-Saxon social and fiscal systems, serving as the basis for calculating public burdens, including the trinoda necessitas (military service, bridge repair, and fortress maintenance). While nominally representing one hundred and twenty acres, the hide was not a fixed geographical measure but rather a fiscal abstraction of land capacity and value. This elasticity allowed for variations based on soil fertility and regional agricultural practices across different shires.
Following the Norman Conquest of 1066, the hide was retained as the primary administrative unit for 'geld' or taxation, as famously recorded in the Domesday Book of 1086. It eventually formed the basis of the feudal ladder, where the 'knight's fee'—the amount of land required to support a knight—was often computed as comprising five hides. Over time, the hide was superseded by the carucate in Danelaw territories and eventually by more standardized acreage as feudalism evolved into early modern estate management.