fealty -
Fidelity to one's lord; the feudal obligation by which the tenant or vassal was bound to be faithful to his lord; fidelity; allegiance; faithfulness.
fealty -
The oath by which this obligation was assumed.
Wikipedia
fidelitas, is a pledge of allegiance of one person to another. Typically the oath is made upon a religious object such as a Bible or saint's relic, thus binding the oath-taker before God. In medieval Europe, fealty was sworn between two people, the obliged person and a person of rank.
