The word for today is…
fealty (noun) –
1a : the fidelity of a vassal or feudal tenant to his lord
b : the obligation of such fidelity
2 : intense fidelity
Source : Merriam -Webster
Etymology : In The Use of Law, published posthumously in 1629, Francis Bacon wrote, “Fealty is to take an oath upon a book, that he will be a faithful Tenant to the King.” That’s a pretty accurate summary of the early meaning of fealty. Early forms of the term were used in Middle English around 1300, when they specifically designated the loyalty of a vassal to a lord. Eventually, the meaning of the word broadened. Fealty can be paid to a country, a principle, or a leader of any kind—though the synonyms fidelity and loyalty are more commonly used. Fealty comes from the Anglo-French word feelté, or fealté, which comes from the Latin fidelitas, meaning “fidelity.” These words are ultimately derived from fides, the Latin word for “faith.”
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