Histoire de l'Inquisition en France is a book published in 1829 by Etienne Leon de Lamonthe-Langan, supposedly on the basis of his unprecedented access to Church archives in Toulouse, granted by one Bishop Hyacinthe Sermet.
The dramatic and blood curdling accounts of Histoire were incorporated as a primary source into many other volumes, notably Joseph Hansen's Quellen und Untersuchungen zur Geschichte des Hexenwahns und der Hexenverfolung im Mittelalter ("Sources and investigations regarding the history of obsessive belief in witches and witch hunts in the middle ages"), which in turn became the source for many other works. Ultimately, Lamonthe-Langan's work became the sole or principal primary source for a substantial part of twentieth century popular and historical beliefs about the Inquisition, witchcraft, torture and jurisprudence in the mediaeval period.
In the early 1970s, two historians (Norman Cohn, Richard Kieckhefer) independently discovered that the Histoire was a fabrication; Lamonthe-Langan's archive did not exist, he did not have the paleographic skills to read books of that age anyway, several major events he described could not have occurred, and his book was full of anachronisms.
Prior to fabricating the Histoire, Lamonthe-Langan had been an author of gothic horror novels. Subsequently, he went on to forge several autobiographies of French historical figures.
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