It is no longer the practice to exact the performance of fealty, as a feudal obligation.
Wharton
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The single-minded fealty to a goal irrespective of costs. The grim acceptance of misery, and the Jedi mind trick that tells you it's not so bad.
J. Maarten Troost. Headhunters on My Doorstep, p.95 (2013)
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nor do philosophers pin their faith to others’ precepts in such wise that they lose their liberty, and cease to give credence to the conclusions of their proper senses. Neither do they swear such fealty to their mistress Antiquity, that they openly, and in sight of all, deny and desert their friend Truth.
William Harvey. On The Motion of The Heart And Blood In Animals (1628)
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This was one of the strangest scenes in history. The German and Russian Emperors took an oath of eternal mutual fealty before the tomb of Frederick the Great.
Leo Tolstoy. War and Peace: 03 (Book Three) . Simon & Schuster
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As I saw that he was restrained by fealty to Little Britain from saying as much as he could, and as I knew with thankfulness to him how far out of his way he went to say what he did, I could not press him.