Judith Butler on Hannah Arendt The Jewish Writings
An oath of fealty, from the Latin fidelitas (faithfulness), 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 (vassal) and a person of rank (lord). This was done as part of a formal commendation ceremony to create a feudal relationship.