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.
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In 2000, Brinkmann together with Jean-Jacques Cassiman used DNA testing to prove that Louis XVII of France who died in captivity as a 10-year-old was indeed the son of Louis XVI of France and Marie Antoinette.