Comparable to loyalty, an Oath of Fealty was often sworn to the feudal lord, most commonly on a religious item such as a bible, or a relic that had some form of significance to those involved.
Derived from Fidelity, to be true or loyal to a person. Often used in the context of relationships saying to be faithful.
"I shall not forget, nor fail to reward that which is given. Fealty with love, valor with honor oath-breaking with vengeance."
"My fealty to you, my Lord, is undying. I am true."