Knight-service in the context of "Feudal lord"

An overlord in the English feudal system was a lord of a manor who had subinfeudated a particular manor, estate or fee, to a tenant. The tenant thenceforth owed to the overlord one of a variety of services, usually military service or serjeanty, depending on which form of tenure (i.e. feudal tenancy contract) the estate was held under. The highest overlord of all, or lord paramount, was the monarch, who due to his ancestor William the Conqueror's personal conquest of the Kingdom of England, owned by inheritance from him all the land in England under allodial title and had no superior overlord, "holding from God and his sword", although certain monarchs, notably King John (1199–1216) purported to grant the Kingdom of England to Pope Innocent III, who would thus have become overlord to English monarchs.

A paramount lord may then be seen to occupy the apex of the feudal pyramid, or the root of the feudal tree, and such allodial title is also termed "radical title" (from Latin radix, root), "ultimate title" and "final title". William the Conqueror immediately set about granting tenancies on his newly won lands, in accordance with feudal principles. The monarch's immediate tenants were the tenants-in-chief, usually military magnates, who held the highest status in feudal society below the monarch. The tenants-in-chief usually held multiple manors or other estates from the monarch, often as feudal barons (or "barons by tenure") who owed their royal overlord an enhanced and onerous form of military service, and subinfeudated most to tenants, generally their own knights or military followers, keeping only a few in demesne. This created a mesne lord – tenant relationship. The knights in turn subinfeudated to their own tenants, creating a further subsidiary mesne lord – tenant relationship. Over the centuries for any single estate the process was in practice repeated numerous times.

Under feudalism in France and England during the Middle Ages, tenure by serjeanty (/ˈsɑːrdʒənti/) was a form of tenure in return for a specified duty other than standard knight-service.

A lord paramount, in feudal law, is an overlord who holds his fief from no superior lord. Such a person holds allodial title, owing no socage or feudal obligations such as military service, in contrast to a mesne lord who holds his fief from a superior.

Socage (/ˈsɒkɪdʒ/) was one of the feudal duties and land tenure forms in the English feudal system. It eventually evolved into the freehold tenure called "free and common socage", which did not involve feudal duties. Farmers held land in exchange for clearly defined, fixed payments made at specified intervals to feudal lords. In turn, the lord was obligated to provide certain services, such as protection, to the farmer and other duties to the Crown. Payments usually took the form of cash, but occasionally could be made with goods.

Socage contrasted with other forms of tenure, including serjeanty, frankalmoin and knight-service.

In feudal Anglo-Norman England and Ireland, a knight's fee was a unit measure of land deemed sufficient to support a knight. It would not only provide sustenance for himself, his family, and servants, but also the means to furnish himself and his retinue with horses and armour to fight for his overlord in battle. It was effectively the size of a fief (or "fee" which is synonymous with "fief") sufficient to support one knight in the ongoing performance of his feudal duties (knight-service).

A knight's fee cannot be stated as a standard number of acres, as the required acreage to produce a given crop or revenue would vary depending on many factors, including its location, the richness of its soil and the local climate, as well as the presence of other exploitable resources such as a fishing weir, quarries of rock, or mines of minerals. If a knight's fee is deemed coterminous with a manor, an average size would be between 1,000 and 5,000 acres, of which much in early times was still "waste", forest and uncultivated moorland.

In old English law, a capite (from Latin caput, head) was a tenure in subinfeudation, by which either person or land was held immediately of the king, or of his crown, either by knight-service or socage. A holder of a capite is termed a tenant-in-chief.

Tenures in capite were abolished by the Tenures Abolition Act 1660.