text: Etienne du Junca, the source of most of our information about him, records that he had been at Pignerol with Benigne d'Auvergne de Saint-Mars before his 1698 arrival at his more famous residence.
full_question: Etienne du Junca, the source of most of our information about him, records that he had been at Pignerol with Benigne d'Auvergne de Saint-Mars before his 1698 arrival at his more famous residence. In an anime version of the work most associated with him, he plays a villainous role more similar to Doctor Doom than to the maltreated character played in live action films by Beau Bridges, Douglas Fairbanks, Louis Hayward, and, most recently, Leonardo DiCaprio. Du Junca's record makes mention of "black velvet," and Voltaire, in 1751, was the first to associate him with metal. For ten points, name this mysterious prisoner, hypothesized to be the identical twin brother of Louis XIV, the subject of a novel by Alexandre Dumas.
first_sentence: Etienne du Junca, the source of most of our information about him, records that he had been at Pignerol with Benigne d'Auvergne de Saint-Mars before his 1698 arrival at his more famous residence.