Noun
English Wikipedia has an article on:serjeantyWikipedia
serjeanty (countable and uncountable, plural serjeanties)
(law, historical) A kind of land tenure requiring some service to the land's chief lord—other than military service—as an obligation to maintain possession.
The manor of Scrivelsby in England, has since the Middle Ages, been held by the Marmion family in grand serjeanty in exchange for their service as King's or Queen's Champion.