 While many of Descartes’s letters to Elisabeth were published in the volumes of his correspondence edited by Clerselier after his death, Elisabeth refused Pierre Chanut’s request to publish her side of the exchange. Elisabeth’s side of the correspondence was first published in a volume by A. Foucher de Careil, after he was alerted to its existence by an antiquarian bookseller, Frederick Müller, who had found a packet of letters in Rosendael, outside Arnhem. These same letters are what appear in the Oeuvres of Descartes, edited by Charles Adam and Paul Tannery. The letters from Rosendael are not originals, but rather copies that date from the early 18th century. While we do not know the provenance of the copies, the consistency of their content with that of Descartes’s letters, along with allusions to events in Elisabeth’s family and private life, argues strongly in favor of the authenticity of the copies.