margrave

noun2

1. •
   (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.

   • The Margrave of Bruges was their head. — 1516
2. •
   (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.