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fealty

noun, plural fe·al·ties.

History/Historical.
1. fidelity to a lord.
2. the obligation or the engagement to be faithful to a lord, usually sworn to by a vassal.
fidelity; faithfulness.

noun plural -ties

(in feudal society) the loyalty sworn to one’s lord on becoming his vassalSee homage (def. 2)

c.1300, from Old French feauté “loyalty, fidelity; homage sworn by a vassal to his overlord; faithfulness,” from Latin fidelitatem (nominative fidelitas) “fidelity,” from fidelis “loyal, faithful” (see fidelity).