La Voisin
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Catherine Monvoisin, or Montvoisin, née Deshayes, known as "La Voisin", was a French fortune teller, commissioned poisoner, and professional provider of alleged sorcery. She was the head of a network of fortune tellers in Paris providing poison, aphrodisiacs, abortion, purported magical services and the arranging of black masses, with clients among the aristocracy and became the central figure in the famous affaire des poisons. Her purported organization of commissioned black magic and poison murder was suspected to have killed 1,000 people, but it is believed that upwards of 2,500 people might have been murdered.
Catherine Deshayes, "La Voisin", 17th-century print of her portrait held by a winged devil.
Catherine Monvoisin and the priest Étienne Guibourg are shown performing a black mass for Madame de Montespan (lying on the altar) in an 1895 engraving by Henry de Malvost
Black Mass
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A Black Mass is a ceremony celebrated by various Satanic groups. It has allegedly existed for centuries in different forms, and the modern form is intentionally a sacrilegious and blasphemous parody of a Catholic Mass.
The Guibourg Mass by Henry de Malvost, from the book Le Satanisme et la magie by Jules Bois, Paris, 1903
Sixteenth century woodcut depicting Black Mass
Engraving from a 1797 edition of Justine, by the Marquis de Sade