A more thorough explanation:

Definition: In medieval times, commendation was the act of becoming a feudal tenant of a lord in order to receive the lord's protection.

Example: A knight who wanted to become a vassal of a lord would perform a commendation ceremony, in which he would pledge loyalty and service to the lord in exchange for the lord's protection and support.

Explanation: Commendation was an important part of the feudal system, which was the dominant social and political system in medieval Europe. By becoming a vassal through commendation, a knight or other noble could gain the support and protection of a more powerful lord, who would provide land, resources, and military aid in exchange for loyalty and service. This system helped to maintain order and stability in medieval society, but also reinforced social hierarchies and limited individual freedom.