Definition
A marquis is the French spelling of marquess, a noble rank in Europe, positioned between a duke and an earl (or count) π. Functionally, marquis and marquess refer to the same position. It's like the difference between "color" and "colour" - same thing, different spelling. Like a marquess, a marquis historically controlled a border region or "march." The title is hereditary, passed down through families. The term is used in French-speaking regions and contexts.