Franz Leopold Lafontaine

He married Maria Theresia Kornély (1765–1827), daughter of Joseph Kornély (né Nathan Adelkind),^[3] a wealthy Polish-Hungarian Court Jew converted to Catholicism.^[3] Kornély was a Jewish merchant, originally from Poland, established in Ungvár, Hungary. Baptized, he takes the name of Joseph Kornély, in memory of an illustrious ancestor, Cornelius Adelkind, a 16th-century Venetian printer and publisher.^[4][5] They had two daughters:

• Sophie (1790–1831), married Count Hans Moritz von Hauke. Through her, Lafontaine was the maternal grandfather of Julia, Princess of Battenberg. Through her, Lafontaine is an ancestor to Charles III and other descendants of Prince Philip, Duke of Edinburgh, in the British royal family, and also an ancestor to King Felipe VI of Spain and other descendants of Victoria Eugenie of Battenberg, in the Spanish royal family.
• Victoria (1797–1849), married firstly Kazimierz Tomasz Słupecki, Rawicz coat of arms (1782–1832) and married secondly Stanislaus Albert Friedrich von Lessel (1807–1888). She had issue from both marriages.

• Kierzek, Andrzej (2010). "Franciszek Leopold Lafontaine (1756–1812) and his work on catarrh". Otolaryngol Pol (in Polish). 64 (2). Poland: 118–21. doi:10.1016/S0030-6657(10)70047-0. ISSN 0030-6657. PMID 20568542.

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