Vas·sal n.
  1. Feud. Law The grantee of a fief, feud, or fee; one who holds land of a superior, and who vows fidelity and homage to him; a feudatory; a feudal tenant.
  2. A subject; a dependent; a servant; a bondman; a slave.  “The vassals of his anger.”
  Rear vassal, the vassal of a vassal; an arriere vassal.