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In July 1709, an old king fed a stack of papers into a fire.

Louis XIV was 70 years old, the longest-reigning monarch in French history, the Sun King, a man with servants for everything; servants to dress him, servants to hand him his shirt in a ranked ceremony, servants whose entire job was candles. He did not burn his own documents.

For these, he made an exception. He had the official transcripts of a criminal tribunal brought to him, a tribunal that had been shut down 27 years earlier. And he watched the files burn until there was nothing left to read.

What was in them is the story I want to tell. It survives at all because the police chief who ran the investigation kept personal notes the king never got, and those notes sit in the Bibliothèque nationale in Paris today. They describe the biggest criminal scandal of the 17th century: a shadow economy of fortune-tellers, abortionists, alchemists, and renegade priests, run largely by women, serving everyone from shopgirls to duchesses…and, at the end of the trail, quite possibly the most powerful woman in France, buying what she could not get any other way.

The French called it l’affaire des poisons. The Affair of the Poisons.

The Divineresses

Let’s begin with what a woman in 1670s France could not do. She could not divorce. She could not, in most cases, control her own property inside a marriage. She could not refuse her husband. She could not prosecute him for beating her. If he was cruel, or syphilitic, or drinking the estate away, the law’s answer was that she had chosen him and God would sort it out.

So a parallel institution grew up to serve her. Paris was full of women called divineresses — fortune-tellers — and fortune-telling was the storefront for a full-service trade. Palm readings and horoscopes at the front. In the back: love powders for the wife losing her husband’s attention, contraception and abortion for the women the law pretended didn’t need them, and, for the truly desperate, the product whose nickname tells you the whole business model.

Poudre de succession. Inheritance powder.

Arsenic, mostly, gussied up with ritual. Slipped into food or blended into cosmetics, it produced a slow decline that looked like any of a dozen natural illnesses, and 17th-century medicine could not tell the difference. For a woman chained by law to a man she feared, the divineresses sold the only divorce on the market.

The queen of the trade was Catherine Monvoisin, a midwife and fortune-teller known professionally as La Voisin, who operated out of a house with a garden in the Villeneuve district of Paris. She employed a network of apothecaries, alchemists, and priests willing to freelance. Her client list, when it finally spilled out, read like a court directory: countesses, duchesses, a marshal of France, two nieces of the late Cardinal Mazarin. Versailles came to her back door wearing dark veils, in secret.

Everyone in Paris half-knew. In 1676, the Marquise de Brinvilliers had been beheaded and burned for poisoning her father and two brothers for the inheritance, and she reportedly said before death that half the people of quality did the same, and she was the only one being prosecuted.

She was right on both counts. For three more years, nobody in power wanted to look.

The Burning Court

The unraveling began at a dinner party.

In late 1678 a fortune-teller named Marie Bosse, deep in her cups, boasted that a few more poisoning commissions and she could retire rich. Someone at the table repeated it to someone. The someone told the police.

The police, unfortunately for everyone from the gutter to the throne, meant Gabriel Nicolas de La Reynie. The first Lieutenant General of Police of Paris, effectively the inventor of the modern police force, and a man with a long private file of aristocratic deaths that had never smelled right to him. He arrested Bosse. Bosse talked. Each arrest opened three more doors, and behind every door was another divineresse with another client book, and the client books pointed up, up, up.

In April 1679, Louis XIV created a special tribunal to handle what the arrests were uncovering. Officially it was a royal commission. Everyone called it by the old name for heresy courts: the Chambre Ardente. The Burning Court. It met in a chamber hung with black, lit by torches, and over three years it held 210 sessions, issued 319 arrest warrants, and interrogated suspects by the hundreds; with torture, as was standard.

The testimony that came out of those sessions described love philtres and inheritance powders, and then it kept going, into renegade priests performing black masses over the bodies of noblewomen, rituals to bind lovers and kill rivals, allegations of infants bought and sacrificed. How much of that was real, how much was tortured invention, and how much was La Voisin’s own marketing is genuinely unknowable.

La Reynie himself, in his private notes, agonized over it. He believed some of it. He could prove almost nothing. The one thing true beyond doubt is that the trade in actual poison was real, the clientele was real, and the murders were real.

The court’s ledger closed at 36 executions. Suspects of quality mostly didn’t burn: the Countess of Soissons — Olympe Mancini, once the king’s own young love — fled France ahead of her arrest warrant and never returned. Her sister the Duchess of Bouillon swept into the tribunal with an entourage, treated the judges like tradesmen, and swept out. The Marshal-Duke of Luxembourg endured a stint in the Bastille and emerged to keep commanding armies. The women of the trade, the ones who’d sold what the ladies bought, went to the stake.

La Voisin burned in the Place de Grève on February 22, 1680, defiant to the end. By her jailers’ accounts she spent her last night drinking and singing, and shoved the priest away at the scaffold. She had kept her biggest secret through every interrogation. She never once said the name that would have burned the kingdom down.

Her daughter said it, though.

The King’s Bed

After the execution, La Voisin’s daughter Marie-Marguerite, still in custody and fighting for her life, told La Reynie what her mother had taken to the stake. The client of 13 years, the one since 1667. The buyer of love powders that had gone into the king’s own food. The noblewoman over whose body, the renegade priest Guibourg confirmed in his own chilling testimony, black masses had been performed to hold the king’s love.

Athénaïs de Montespan. The official mistress of Louis XIV. Mother of seven of his children. For a decade, the most powerful woman in France.

And the testimony went darker still: that when the king’s affection finally drifted to a younger rival, Angélique de Fontanges, the circle had discussed poisoning her, and perhaps the king himself.

Was it true? The witnesses were tortured or facing the stake, with every incentive to produce something valuable. The details were lurid in exactly the way interrogators’ questions invite. And yet, the timeline of Montespan’s rise matched, multiple witnesses corroborated independently, and La Reynie, the most rigorous investigator in France, could not make it fall apart.

His notes read like a man holding a live coal. When Fontanges, the young mistress, then died in 1681, at about 20, of what the autopsy called natural illness, all of Paris knew what had happened.

Louis’s response tells you what he believed, or at least what he feared. The tribunal’s proceedings were suspended the moment his mistress’s name entered them. When the Burning Court resumed, the sensitive cases were removed entirely. Montespan was never charged, never questioned, never cleared. And the suspects who had spoken her name never saw a courtroom again: they were locked away for life in scattered fortresses under lettres de cachet, imprisonment by royal signature, no trial, no appeal, and under standing orders that they were never to speak of the affair to anyone.

Some were reportedly chained in solitude precisely so they couldn’t talk. They could not be convicted, because a trial meant testimony. They could not be freed, because freedom meant gossip. So they simply stopped existing.

In 1682 the king dissolved the Burning Court altogether. The trade it had been built to destroy, La Reynie noted grimly, carried on underground.

The Fire

Montespan was never punished and never forgiven. Her position at court dwindled for a decade until she was displaced by the serenely pious Madame de Maintenon, and she ended her days in convents and good works. Whatever she had or hadn’t bought from La Voisin, the rumor did what no rival could.

And in 1709, the king burned the files.

He was old. Montespan was dead by then; so was La Reynie. There was no one left to protect except the story of his own reign. The Affair of the Poisons had begun as a crackdown on a women’s shadow economy: the fortune-tellers, the abortionists, the sellers of quiet widowhood. Three dozen of those women and their associates went to the stake or the gallows.

But when the thread was followed all the way up, out of the back-alley consulting rooms and through the veiled clients and into the royal bedchamber itself, the state’s appetite for truth ended instantly. The women at the bottom of the trade burned while the woman at the top were protected. And the evidence, the whole official record of the largest criminal investigation of the century, went into a fireplace by the king’s own hand.

Because here is what the files really documented, and what Louis actually destroyed: proof of where the demand came from.

The trade in powders and black masses and secret murder was not an infection of the court from below. It was commissioned from above, by the most glittering people in France, because even at Versailles (especially at Versailles) women were bargaining for love, safety, and survival with no legal currency to bargain in. La Voisin didn’t corrupt the nobility. She simply charged top dollar for it.

I would love to go into more detail about what the evidence reveals specifically, but that is a tale for another day, and is besides the point.

Because here is the tragedy under all the glitter. The 36 people the Burning Court sent to the stake and the gallows were mostly women, and most of them burned for providing services to other women who had nowhere else to go. The love powders, the contraception, the abortions, the quiet ways out of brutal marriages, that whole trade existed because half the population of France had no rights the law was required to respect. No divorce. No property. No refusal. The divineresses were the only institution that served women as if their lives were their own. For that, the state burned them. The duchesses who bought went home in their carriages. The women who sold went into the fire.

And the king covered up a murder plot in his own bedchamber to protect the shine on his crown.

But burn carefully, if you’re going to burn. Louis destroyed the transcripts and missed the notebooks. One good cop’s private notes, the doubts, the testimony, the names, outlived the king, the mistress, and the monarchy itself. They sit today in the national library of the republic that replaced them. So everyone can now see exactly what the Sun King fed to that fireplace in 1709: the corruption inside his own house, the murder he buried, the reason for all of it. His legacy was the whole point of the cover-up; and his legacy is now permanently stained with what he covered up.

RIP to the executed women of the Burning Court. They kept their clients’ secrets under torture, most of them. They served the women France refused to serve. Punk AF.

And if we remember them, if we talk about them, if we write about them, they cannot disappear.

Thanks for reading!

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