This form of lordship was called seigneurie, the rights that the seigneur was entitled to were called seigneuriage, and the seigneur himself was the seigneur justicier, because he exercised greater or lesser jurisdiction over his fief. Since the repeal of the feudal system on 4 August 1789 in the wake of the French Revolution, this office has no longer existed and the title has only been used for sovereign princes by their families.
In common speech, the term grandseigneur has survived. Today this usually means an elegant, urbane gentleman. Some even use it in a stricter sense to refer to a man whose manners and way of life reflect his noble ancestry and great wealth. In addition, Le Grand Seigneur had long been the name given by the French to the Ottoman sultan. Notre Seigneur Jésus-Christ is the French equivalent of the English Our Lord Jesus Christ.
The word seignorage is also derived from seigneur.
Seigneur Style or Title - Remains Legal in the Crown Dependencies
Style of Seigneur or Dame are Legally Used in Bailiwick of Guernsey - As per the The Feudal Dues (Guernsey) Law, 1980 Style of Seigneur of a Fief Section 4. The foregoing provisions of this Law shall be without prejudice – (a) to the right of any person to use, in the case of a male person, the style of Seigneur and, in the case of a female person, the style of Dame, of a fief, (b) to the feudal relationship between Her Majesty and any person holding an interest in a private fief on or at any time after the commencement of this Law, or to the feudal relationship between any person holding an interest in any fief and any person holding an interest in a dependency of that fief, and (c) to the right or obligation of any person by virtue of that person holding an interest in any fief which is not a right to which those provisions apply or any obligation correlative thereto. Feudal Dues Guernsey Law of 1980