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In page La Voisin:

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In 1673, when the king's interest in Montespan seemed to wane, Montespan again employed La Voisin, who provided a series of black masses officiated by Étienne Guibourg.[citation needed] On at least one occasion, Montespan herself acted as the human altar during the mass.[2] La Voisin also provided Montespan with an aphrodisiac, with which Montespan drugged the king.[citation needed] During the king's affair with Madame de Soubise, Montespan used an aphrodisiac provided by La Voisin's colleague Françoise Filastre and made by Louis Galet in Normandy.[citation needed]