Assertion: knight's lord | /r/HasProperty | subject
Facets:
Source sentences:
text: The system of knight-service introduced into England by William the Conqueror empowered the king, or even a superior lord who was a subject, to compel every holder of a certain extent of land, called a knight’s fee, to become a member of the knightly order; his investiture being accounted proof that he possessed the requisite knightly arms, and was sufficiently trained in their use.