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Heinrich XX, Prince Reuss of Greiz (29 June 1794 – 8 November 1859), married firstly in 1834 to Princess Sophie of Löwenstein-Wertheim- Rosenberg, no issue, Princess Sophie died in 1838; Married secondly in 1839 to Landgravine Karoline of Hesse-Homburg, had issue.
At his death in 1836, having no male heir, the Head of the House Reuss of Greiz passed to his younger brother Heinrich XX.
Heinrich XIX was born at Offenbach, Grand Duchy of Hesse, younger surviving son of Heinrich XIII, Prince Reuss of Greiz (1747–1817), (son of Heinrich XI, Prince Reuss of Greiz and Countess Conradine Reuss of Köstritz) and his wife, Princess Wilhelmine Louise of Nassau-Weilburg (1765–1837), (daughter of Charles Christian, Prince of Nassau-Weilburg and Princess Carolina of Orange-Nassau).
Heinrich XXIV was born at Greiz, Reuss Elder Line, only son of Heinrich XXII, Prince Reuss of Greiz (1846–1902), (son of Heinrich XX, Prince Reuss of Greiz and Princess Caroline of Hesse-Homburg) and his wife, Princess Ida of Schaumburg-Lippe (1852–1891), (daughter of Adolf I, Prince of Schaumburg-Lippe and Princess Hermine of Waldeck-Pyrmont).
Caroline was a daughter of the reigning Heinrich XXII, Prince Reuss of Greiz by his wife Princess Ida, daughter of Adolf I, Prince of Schaumburg-Lippe.