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Gaston Louis Alfred Leroux (6 May 1868 – 15 April 1927) was a French journalist and author of detective fiction.

In the English-speaking world, he is best known for writing the novel The Phantom of the Opera (Le Fantôme de l'Opéra, 1910), which has been made into several film and stage productions of the same name, such as the 1925 film starring Lon Chaney; and Andrew Lloyd Webber's 1986 musical.

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