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. On at least one occasion, Montespan herself acted as the human altar during the mass. La Voisin also provided Montespan with an aphrodisiac, with which Montespan drugged the King. During the King's affair with Madame de Soubise, Montespan used an aphrodisiac provided by Voisin's colleague Françoise Filastre and made by Louis Galet in Normandy.