society > trade and finance > fees and taxes > impost, due, or tax > payment or service to feudal superior > [noun] > payment in lieu of service > in lieu of castle-guard (3)
Feudal System. A kind of knight-service, whereby a feudal tenant was bound, when required, to defend the lord's castle; the tenure of such service.
Feudal System. = castle-guard, n. 2 3.
A due paid in commutation of the service of castle-guard, n., castleward, n.