/ˈfiːəlti/ – noun
Definition: lòng trung thành với lãnh chúa, lời thề trung thành.
A more thorough explanation: Fealty is a legal term that refers to the fidelity and loyalty owed by a vassal to his feudal lord. It is a formal oath of allegiance and loyalty sworn by a vassal to his lord, typically involving the vassal’s promise to support and serve the lord in exchange for protection and land.
Example: The vassal swore fealty to his lord, pledging loyalty and obedience in exchange for protection and land.