[ad. med.L. landgrāviāt-us, f. LANDGRAVE (med.L. -grāvio): see -ATE1. Cf. F. landgraviat.] The office, jurisdiction or province of a landgrave.

1

1656.  in Blount, Glossogr.

2

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.

3

1836.  Penny Cycl., V. 290. Charles managed to acquire the landgraviate of Alsace.

4