Background
lieutenant was her statement, made after the execution of her mother, that implicated the royal mistress Madame de Montespan in the process, causing Louis XIV to eventually disrupt the whole investigation and classify it as secret. Marie Marguerite Monvoisin was the daughter of the jeweler Antoine Monvoisin and the famous professional fortune teller Louisiana Voisin. Her mother was in fact the center of a criminal network providing poison and black masses for the aristocracy.
She was not arrested with her mother 12 March 1679, but remained with her father Antoine Monvoisin until his death of natural causes in May 1679.
Career
The reason for their arrest is unknown. About the same time, Adam Lesage made his confession, which added that child sacrifice had taken place during the black masses arranged by Louisiana Voisin. On 1 October, Françoise Filastre confirmed Monvoisins statement of Montespan and Lesages statement about child sacrifice.
The confession involved so many people of high rank that the king ordered the official investigation closed.
The 9 October, Monvoisin confirmed the statement of child sacrifice made by Lesage and Filastre, followed by the confirmation of Étienne Guibourg 10 October. The statements of Marguerite Monvoisin was considered vital, in particular as she was not accused to have taken part in any crime personally, but was exclusively a witness.
Étienne Guibourg, Louis Galet, Adam Lesage and Romani were incarcerated at Château de Besançon, and Betrand at Château de Salces: Marguerite Monvoisin, together with her mother"s female associates Louisiana Pelletière, Louisiana Poulain, Magdelaine Chapelain, Marguerite Delaporte and Catherine Leroy, were imprisoned at Belle-Île-en-Mer. The date of her death is unknown.
lieutenant was ordered that the female prisoners from the Poison Affair should be guarded by women to prevent that they use their sexuality to escape.
Unlike their male accomplices, the women were not to be chained as long as they behaved well. lieutenant is noted, that in January 1687, the women at Belle-Île-en-Mer was from now granted the use of braziers in midwinter. All the prisoners were condemned to silence and their guards informed that they tend to be habitual liars about Madame de Montespan.
Membership
The remaining members of the organisation were never put on trial, but incarcerated for life by lettre de cachet, and their confessions were sealed.
