Landgrave
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
A name formerly given to those who executed justice on behalf of the German emperors, with regard to the internal policy of the country. It was applied, by way of eminence, to those sovereign princes of the empire who possessed by inheritance certain estates called "land-gravates," of which they received investiture from the emperor. Enc. Lond.