Illustrious Highness
Gertrude Falkenstein was the former wife (m. Graven-Rheindorf, 30 November 1822) of Lt Karl Michael Lehmann (Bischofswerder, 16 June 1787 – Wandsbek, 1882), whom his father William II made her "Her Illustrious Highness" Countess of Schaumburg in (1831) and whom he made Princess ("Fürstin") of Hanau and to Horowitz in (1853).