feudatory

(noun) a person holding a fief; a person who owes allegiance and service to a feudal lord. Synonyms: vassal, liege, liegeman, liege subject.

(adj) of or pertaining to the relation of a feudal vassal to his lord. Example: "A feudatory relationship."

(adj) owing feudal allegiance to or being subject to a sovereign. Example: "It remained feudatory to india until 1365."