WordNet sense 1 (a person holding a fief; a person who owes allegiance and service to a feudal lord):

vassal, feudatory, liegeman, liege subject

WordNet sense 2 (a feudal lord entitled to allegiance and service):

liege lord

WordNet sense 3 (city in eastern Belgium; largest French-speaking city in Belgium):

Luik

WordNet sense 4 (steadfast in allegiance or duty):

loyal