Knight-Service
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
A species of feudal tenure, which differed very slightly from a pure and perfect feud, being entirely of a military nature; and it was the first, most universal, and most honorable of the feudal tenures. To make a tenure by knight-service, a determinate quantity of land was necessary, which was calied a "knight's fee," (feodum militare,) the measure of which was estimated at 680 acres.
Co.. Litt. 69a; Brown.