One of history's most enduring mysteries emerged from the dungeons of Louis the Fourteenth's France. A man arrested in sixteen sixty-nine under the alias Eustache Dauger spent the next thirty-four years locked away across four successive prisons, including the infamous Bastille. His true identity was so zealously guarded that it died with him in secrecy. According to Boing Boing, he was held in custody by Bénigne Dauvergne de Saint-Mars—a guardian as mysterious as his charge. The case inspired centuries of speculation, but the masked prisoner's real name remains unknown.

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