Catherine Deshayes

Catherine Monvoisin, or Montvoisin, née Deshayes, known as "La Voisin", was a French fortune teller, commissioned poisoner, accused of witchcraft. She was the head of a network of fortune tellers in Paris providing poison, aphrodisiacs, and abortions 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.