[ad. med.L. landgrāviāt-us, f. LANDGRAVE (med.L. -grāvio): see -ATE1. Cf. F. landgraviat.] The office, jurisdiction or province of a landgrave.
1656. in Blount, Glossogr.
1709. Lond. Gaz., No. 4542/1. His Imperial Majesty has been pleased to grant him the Landgraviate of Leuchtenberg, an immediate Fee of the Empire.
1836. Penny Cycl., V. 290. Charles managed to acquire the landgraviate of Alsace.