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A member of the Club of the Cordeliers, representative of the Paris Commune, on 3 July 1793, he was designated to watch over Louis XVII at the Temple,
In 1998 Professor Cassiman proved through DNA testing that Karl Wilhelm Naundorff was not a descendant of the Bourbons and certainly not Louis XVII.
His most celebrated books, L'affaire Louis XVII (Tallandier, 1995, 2000) and Louis XVII : la vérité (Pygmalion, 2000) have attracted intense interest from the public and the media due to their groundbreaking analyses of DNA research on a human heart long-supposed to be that of Louis XVII, dead in Temple Tower, Paris, in 1795.