The Poison Affair (The Case of Poisons)

The Affair of the Poisons (French: L'affaire des poisons) was a large-scale criminal investigation and trial that emerged in late 1670s and early 1680s during the reign of King Louis XIV of France. It encompassed members of the aristocracy court officials and Paris’s underworld. The affair is characterized by the exposure of a complex network of crimes involving poison production and distribution witchcraft abortion and rituals known as “black masses.” This process is regarded as a pivotal historical moment in the development of modern police organizations and forensic investigation techniques in France.

Historical Background and Preceding Events

The social and legal foundation of The Affair of the Poisons began with the trial and execution in 1676 of Marquise de Brinvilliers (Marie Madeleine Dreux d’Aubray). Brinvilliers poisoned her father and two brothers to secure their inheritance. Her trial heightened public awareness of poison use and sparked widespread fear of a “poisoning impulse.”

The Brinvilliers case demonstrated how poison was used as a tool in family conflicts and inheritance disputes. Marquise de Brinvilliers obtained access to chemical substances through her lover Godin de Sainte-Croix and pharmacist Christophe Glaser. After her execution and Sainte-Croix’s death the documents found in a chest known as the “cassette” provided the first evidence that deepened the investigation.

The Investigation and the Chambre Ardente

The investigation led by Paris Police Superintendent Gabriel Nicolas de La Reynie began in autumn 1678 following suspicions of a plot to poison the King. As the scope of the inquiry expanded Louis XIV established a special judicial commission known as the Chambre Ardente (Burning Chamber). This court operated between 1679 and 1682 and tried suspects from all levels of society.

• Scope of the Investigation: The court investigated over 400 individuals issued 319 arrest warrants and handed down 34 death sentences.

• Judicial Methods: Interrogations employed torture methods permitted under the legal system of the time to extract confessions from suspects.

• Focus of the Investigation: La Reynie’s inquiry uncovered a loosely organized underworld in Paris composed of fortune tellers witches and “apostate” priests.

The Criminal Network and Practices

The investigation exposed a criminal network operating in Paris that served the aristocracy. At its center were Catherine Deshayes known as La Voisin and other fortune tellers such as La Vigoureux and La Bosse.

Activities

These individuals sold love potions charms and poisons known as “inheritance powders” (poudres de succession). They also provided abortion services.

Rituals and Priests

The investigation revealed that priests such as Étienne Guibourg and Lesage performed “love rituals” or black magic according to their clients’ requests. Some of these rituals allegedly involved the sacrifice of infants as recorded in court documents.

Client Profile

Clients ranged from dukes to laborers but the involvement of court members gave the affair its political dimension.

Connection to the Court and Politics

The most striking aspect of the affair was the involvement of Louis XIV’s inner circle and court members.

Madame de Montespan

The King’s official mistress Madame de Montespan was accused of obtaining spells and potions from La Voisin and priests to win the King’s affection and eliminate rivals. It was alleged that she had mixed love potions into the King’s food and arranged rituals against her competitors.

Other Nobles

High-profile figures such as Olympe Mancini Countess of Soissons and Marie-Anne Mancini Duchess of Bouillon were accused or exiled during the investigation. Marshal Luxembourg and playwright Jean Racine were also among the suspects.

Royal Intervention

When the investigation began to implicate Madame de Montespan Louis XIV halted the proceedings of the Chambre Ardente in 1682 to prevent the scandal from growing further and personally ordered the destruction of documents related to her.

Substances Used and Toxicology

The substances used in The Affair of the Poisons reflected the misuse of contemporary chemistry and pharmacy knowledge.

Types of Poisons

The most commonly used poisons included arsenic (in white yellow and red forms) toad venom corrosive sublimate and opium.

Accessibility

During this period the legal sale of substances such as antimony and arsenic for medical or commercial purposes made them easily accessible. The works of pharmacist Christophe Glaser and chemist Nicolas Lemery made technical knowledge on preparing these substances available even if their intent was not criminal.

Legal Regulations

In the aftermath of the affair Louis XIV issued a strict edict in 1682 regulating the sale of poisonous substances and the establishment of laboratories. This regulation required pharmacists to record the names and dates of individuals to whom they sold toxic substances.

Cultural and Literary Reflections

The Affair of the Poisons influenced contemporary literature and theater bringing themes of “invisible danger” and “suspicion” to the forefront of public imagination.

• Theater: The 1679 play La Devineresse (The Fortune Teller) by Thomas Corneille and Donneau de Visé was performed concurrently with the La Voisin trial and attracted great attention. The play portrayed witchcraft and fortune telling as fraud reflecting the era’s rationalist tendencies.

• Investigation Imagery: The affair laid the groundwork for the transfer of themes of hypocrisy and illusion found in Molière’s Tartuffe and Don Juan into the realm of police investigations and legal proceedings.

• Modern Literature: The affair has continued to serve as a subject in the works of authors such as Arthur Conan Doyle and Alexandre Dumas and in modern historical novels.

Legal Reforms and Social Impact

The Affair of the Poisons marked a turning point in the reorganization of France’s judicial system and public order. In 1682 Louis XIV issued an edict (Édit de 1682) placing both the sale of poisons and witchcraft activities under strict state control.

The 1682 Edict and Poison Control

The royal edict placed the sale of arsenic and similar poisonous substances under state supervision. Pharmacists were now required to maintain a register recording the names and dates of individuals to whom they sold toxic substances. Additionally establishing laboratories and conducting chemical experiments required special permission.

Reclassification of Witchcraft

One of the most significant effects of the edict was the redefinition of witchcraft not as a supernatural power but as superstition idle curiosity (vaines curiosités) and fraud. Louis XIV labeled witches and fortune tellers as imposteurs (fraudsters) thereby justifying their prosecution not for religious heresy but for deceiving the public and selling poison. This step effectively ended the era of witch hunts in France and grounded judicial proceedings in rational principles.

The Police Organization and the End of the Chambre Ardente

Following the affair the Paris Police Organization under Gabriel Nicolas de La Reynie became more organized and centralized. The Chambre Ardente court which conducted the investigation was dissolved in 1682 by Louis XIV due to its expansion into his inner circle and its implications against Madame de Montespan. The King personally ordered the destruction of parts of the court records to protect his mistress.