fealty
/ˈfiːəltɪ/noun
mass noun
1- historical a feudal tenant's or vassal's sworn loyalty to a lord〈史〉（佃户、封臣对封建主的）忠诚, 效忠：
they owed fealty to the Earl rather than the King.
与其说他们应效忠国王, 还不如说他们该效忠伯爵。
1.1
- formal acknowledgement of this效忠宣誓：
a property for which she did fealty.
她发誓要悉心打理的一块地产。
词源
Middle English: from Old French feau（l）tè, fealte, from Latin fidelitas （see FIDELITY）.