Castle serjeanty

Castle serjeanty was a form of feudal tenure by which a manor was held in return for the obligation to provide castle guard: the duty to garrison and defend a specified royal castle for a fixed period each year. It was one of the grand serjeanties, the highest category of service tenure below knight service. The obligation was personal to the manor, not to its lord. When the manor changed hands, the duty transferred with it.

How castle guard worked

Each castle that relied on serjeanty was served by a ring of surrounding manors, each owing a specific contribution. The obligation was usually defined in terms of the number of men to be provided and the number of days per year they were required to serve. Some manors owed a single armed man for a fortnight. Others owed several men for longer periods. The service was typically divided into shifts so that the castle was garrisoned year-round.

The nature of the service varied. Some manors owed general garrison duty. Others had specific assignments: guarding a particular gate, maintaining a section of wall, or providing a watchman for a tower. At Portchester Castle in Hampshire, the surviving records show that individual manors were responsible for specific parts of the fortification.

Portchester Castle and the Portsdown network

Portchester Castle, the most complete Roman fort in northern Europe, served as the hub of a castle serjeanty network that drew on manors across the Portsdown hundred. The VCH records for Hampshire (Vol. 3) document the specific obligations. Cosham owed one armed man. Drayton owed one man to guard the east gate for 15 days. Boarhunt Herbelyn owed a habergellum (a coat of mail or military garment) for service of 20 to 40 days. Wanstead owed one man for eight days. The burgesses of Portchester itself owed 12 men for 15 days.

This network reveals how Norman military organisation shaped landholding. The manors around Portchester were not merely agricultural units. They were nodes in a defensive system, each contributing a defined military resource to the castle that controlled Portsmouth Harbour. The obligations were recorded in Inquisitions Post Mortem and Feudal Aids, and they persisted in legal memory long after the practical need for castle guard had passed.

Other forms of serjeanty

Castle guard was only one form of serjeanty. Grand serjeanty could involve any personal service to the king: carrying his banner, serving at his coronation, providing a specified number of arrows for the royal hunt, or keeping a hawk or hound. Petty serjeanty typically involved a token render, often a weapon or piece of equipment: a lance, a pair of gilt spurs, or a quantity of arrows. These renders were symbolic by the thirteenth century, but they were still recorded and enforced.

The Tenures Abolition Act 1660 converted all tenures (except free and common socage) into socage, effectively ending the feudal obligations. Grand serjeanties attached to coronation services were preserved as ceremonial honours, but the practical obligation of castle guard was extinguished. The records of these obligations survive, however, and provide one of the most detailed windows into how the feudal system actually functioned at the local level.

Why it matters for manorial research

Serjeanty obligations are recorded in sources that also document the descent of the manor: Inquisitions Post Mortem, Feudal Aids, and the hundred rolls. When an IPM records that a deceased tenant held a manor by the serjeanty of providing one armed man to Portchester Castle, it simultaneously confirms the holder, the manor, the obligation, and the date. These records are among the most precise and dateable sources for medieval manorial history.

The network visualisation on this platform maps the Portchester castle serjeanty network, showing which manors owed what service and how the obligations connected them.