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plural margraves
(historical) A feudal era military-administrative officer of comital rank in the Carolingian empire and some successor states, originally in charge of a border area.
(historical) A hereditary ruling prince in certain feudal states of the Holy Roman Empire and elsewhere; the titular equivalent became known as marquis or marquess. quotations
The Margrave of Bruges was their head.
1516, Thomas More, chapter 1, in Utopia