vassal (n.) Look up vassal at Dictionary.com
c.1300 (implied in vassalage) "tenant who pledges fealty to a lord," from O.Fr. vassal, from M.L. vassallus "manservant, domestic, retainer," from vassus "servant," from O.Celt. *wasso- "young man, squire" (cf. Welsh gwas "youth, servant," Bret. goaz "servant, vassal, man," Ir. foss "servant"). The adj. is recorded from 1593.