Marguerite Monvoisin

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Marie Marguerite Monvoisin or Montvoisin, (born c. 1658, date of death unknown), was the daughter of La Voisin and a main witness in the famous Poison Affair. It 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 not arrested with her mother 12 March 1679, but remained with her father Antoine Monvoisin until his death of natural causes in May 1679. The 26 January 1680, she and her two brothers were arrested and taken to Vincennes for questioning. The reason for their arrest is unknown.

In August and July 1680, after the execution of her mother in February, Marguerite Monvoisin made a confession which revealed her mothers list of clients, her connection to Madame de Montespan and the attempted murder of the monarch. About the same time, Adam Lesage made his confession, which added that child sacrifice had taken place during the black masses arranged by La Voisin. In 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.

The remaining members of the organisation were never put on trial, but incarcerated for life by lettre de cachet, and their confessions were sealed.

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 La Pelletière, La Poulain, Magdelaine Chapelain, Marguerite Delaporte and Catherine Leroy, were imprisoned at Belle-Île-en-Mer. The date of her death is unknown. It 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. It 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.

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