The Most Hated Man in the 18th Century: Why Everyone Wanted to Fight the Chevalier d’Eon

Imagine you are a French nobleman in 1777, sitting in a London gentlemen’s club, and someone slides a piece of paper across the table. It’s a betting slip. The London Stock Exchange — yes, the actual financial market — has opened a book on whether a specific living person is a man or a woman. Thousands of pounds have already been wagered. The subject of the bet is currently in the room. They are holding a sword, wearing a dress, and they are furious. This is the life of the Chevalier d’Eon. It only gets more complicated from here.

How It Started

Charles-Geneviève-Louis-Auguste-André-Timothée d’Eon de Beaumont — the Chevalier d’Eon — was born in Tonnerre, France in 1728, lived to 81, and crammed approximately seventeen lifetimes of drama into that span. They were a spy who infiltrated the Russian court of Empress Elizabeth disguised as a woman. In addition, they were a decorated captain who fought in the Seven Years’ War.

They were a diplomat and secret agent for King Louis XV’s covert foreign policy operation. They were a celebrated fencer in their seventies, still giving exhibitions across England. For the second half of their life, they lived openly as a woman. This was not because anyone forced them to or because it was strategically convenient. Instead, it was because they chose to, and they dared anyone to make something of it.

First, the Spy Stuff (Which Is Legitimately Unbelievable)

Before d’Eon became the 18th century’s most talked-about gender mystery, they were one of France’s most effective covert agents. Furthermore, the story of how they got started is the kind of thing that makes you wonder if you’re reading historical fact or a Netflix pitch document.

In 1755, France wanted to repair its diplomatic relationship with Russia. Empress Elizabeth of Russia was famously suspicious of foreign men at her court and notoriously difficult to approach through standard diplomatic channels. Therefore, France’s solution, according to historical accounts that are wild but well-documented, was to send a young French nobleman named d’Eon — who was slender, beardless, and reportedly very convincingly feminine in appearance — into Russia disguised as a woman named “Mademoiselle Lia de Beaumont.” This woman was a lady-in-waiting to a French noblewoman.

It worked. D’Eon infiltrated the Russian court, secured access to the Empress, passed secret correspondence, and helped lay the groundwork for what would eventually become the Franco-Russian alliance. They then returned to France and resumed presenting as male. Next, they went on to serve as a captain in the Seven Years’ War — apparently a perfectly competent soldier. This is a career pivot so jarring that the mere fact of it is a little dizzying.

The Secret du Roi and Why D’Eon Became Untouchable

After their military service, d’Eon was dispatched to London as part of the French diplomatic mission — first as secretary to the ambassador, then, for a period in 1763, as the acting head of mission. And it was in London that things started to get genuinely complicated. This was in the way that only things involving 18th-century secret spy networks, royal blackmail, and tremendous personal charisma can get complicated.

King Louis XV ran a covert foreign policy operation called Le Secret du Roi — the King’s Secret — that operated completely outside official French diplomatic channels. The Foreign Ministry didn’t know about it. Also, the ambassadors didn’t know about it. It was Louis’s personal shadow government, and d’Eon was one of its agents. They were communicating directly with the king and running their own intelligence operations. Additionally, they were generally being impossible to manage from Paris because they had leverage that their superiors couldn’t fully control.

What Went Wrong

The specifics of what went wrong between d’Eon and the French government are dense and documented — there were disputes over expense reimbursements, accusations of insubordination, a genuinely spectacular falling-out with a new ambassador that involved d’Eon publicly humiliating the man in print. But the core of d’Eon’s power was this: they had letters.

Compromising letters from Louis XV himself, relating to sensitive diplomatic matters that France could not afford to have made public. France couldn’t arrest d’Eon without risking exposure. They couldn’t fully fire d’Eon without risking exposure. And they couldn’t afford to let d’Eon just wander around London talking to people. D’Eon was, for a period, essentially ungovernable, and they knew it.

The Bet That Broke London Society

While all of this diplomatic intrigue was playing out, London had gotten obsessed with a question: was the Chevalier d’Eon a man or a woman? The question had been simmering for years — d’Eon’s appearance, their history, the rumors about Russia — and in 1771 it exploded into open betting on the London Stock Exchange. This was legal. People did this. The 18th century was a different place.

By some estimates, the total amount wagered on d’Eon’s biological sex reached the equivalent of roughly £120,000 in the currency of the time — an absolutely staggering sum, representing the kind of gambling that ruined fortunes. Aristocrats, merchants, gamblers, and members of Parliament all had money on the line. The bet became so large and so socially significant that it took on a life of its own. Consequently, people who had never met d’Eon had strong opinions and real financial stakes in the answer. London was obsessed in the way that modern media cycles get obsessed. However, the gossip spread by pamphlet and coffee house rather than Twitter, and the Chevalier d’Eon was reportedly furious about all of it.

D’Eon’s response to the betting was characteristically confrontational: they sued. Several of the people who had wagered — or who had made public claims about their sex — found themselves defendants in legal proceedings. D’Eon argued, among other things, that the betting constituted a form of libel. Nevertheless, the courts did not entirely agree, but the legal actions kept the story alive in the press for years. This kept d’Eon famous, which was arguably what they wanted anyway.

What Happened After Death (This Part Is Actually Devastating)

D’Eon died in 1810 in London, in poverty, having outlived the pension the French government had paid and most of the people who had known them during their years of power and notoriety. They had been living with a Mrs. Cole, a widow who had become a companion and caretaker in their final years. By accounts, it was a genuinely warm relationship and one of the few stable personal connections d’Eon had in old age.

After d’Eon’s death, a doctor examined the body. The conclusion — which was shared with the press and became public within days — was that d’Eon had male anatomy. The news caused a sensation all over again, settling at least the biological aspect of the question that London had been betting on since 1771. People who had wagered on “woman” lost their money. People who had wagered on “man” collected.