A "vassal" is a person in the feudal system who pledges loyalty and service to a more powerful lord or king. In exchange for this loyalty, the vassal receives land or protection. This relationship was common in medieval Europe, where vassals played a crucial role in maintaining the social and political order. Vassals were often knights or nobles who managed their own lands and could have their own vassals beneath them. This hierarchical structure created a network of obligations and support, helping to ensure stability during times of conflict. The concept of vassalage is closely related to feudalism and knighthood.