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Margrave was originally the medieval title for the military commander assigned to maintain the defence of one of the border provinces of the Holy Roman Empire or a kingdom. That position became hereditary in certain feudal families in the Empire and the title came to be borne by rulers of some Imperial principalities until the abolition of the Empire in 1806 (e.g., Margrave of Brandenburg, Margrave of Baden). Thereafter, those domains (originally known as marks or marches, later as margraviates or margravates) were absorbed into larger realms or the titleholders adopted titles indicative of full sovereignty.