The Letters of a Portuguese Nun (Fr. Les Lettres Portugaises), first published anonymously by Claude Barbin in Paris in 1669, is a work believed by most scholars to be epistolary fiction in the form of five letters written by Gabriel-Joseph de La Vergne, comte de Guilleragues (1628–1685), a minor peer, diplomat, secretary to the Prince of Conti, and friend of Madame de Sévigné, the poet Boileau, and the dramatist Jean Racine.
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