Where Roulette Came From: Pascal's Failed Wheel, the Blanc Brothers, and a Devil Who Never Signed Anything
In the 1650s, the French mathematician Blaise Pascal was trying to build a perpetual motion machine, a wheel that would spin forever without any outside force driving it. He failed, as every attempt at perpetual motion has failed before and since. What he left behind, according to many historians who have traced the game's lineage, was a spinning wheel mechanism that would later feed into roulette's design, a hybrid eventually formed with an earlier gaming wheel from 1720 and the Italian game Biribi. Pascal never built a casino game. He built a physics experiment that failed upward, into one of gambling's most recognisable objects.
From Failed Physics to a French Salon Game
The claim that Pascal is roulette's direct inventor is one many historians credit but few can fully verify, since the written record connecting his wheel experiments to the game that emerged decades later is thinner than the popular version of the story suggests. What's better documented is that some form of spinning-wheel gambling game, combining elements of a mechanical wheel with the Italian game Biribi, a number-guessing game already established in French gambling salons, was circulating in France by the 18th century under the name roulette, French for "little wheel." The game's early form already carried the structure that survives today: a spinning wheel, numbered pockets, and a bet placed before the wheel turns.
Biribi itself, the game roulette partly descended from, was a numbers game rather than a wheel game in its original form: a board carried the numbers one through seventy, and a banker drew a winning number from a bag of numbered tickets rather than spinning any wheel. A correct bet paid 64 times the stake, a payout that sounds large next to a board of seventy numbers but that still mathematically favoured the banker by a wide margin, since true odds on a single number out of seventy would need to pay 69 times the stake just to break even. Giacomo Casanova, writing about the game in the 1760s, called it outright a cheats' game, and it was already banned in some of the places he encountered it, a detail suggesting the fraud went beyond the payout structure itself into rigged draws. France banned Biribi formally in 1837; by the 19th century the name had drifted into French army slang, where being "sent to Biribi" meant assignment to a disciplinary battalion in Algeria, a use with nothing left of the original game beyond its name. The 1720 gaming wheel that fed into roulette's other half is less precisely documented than Biribi, appearing in historical accounts as a general gaming-wheel format already in circulation in French gambling houses rather than a single named invention. What emerged from combining a numbers game with a spinning wheel was a genuinely new hybrid, not a renamed version of either source game, and it's this hybrid, not Biribi and not any single 1720 wheel on its own, that historians mean when they place roulette's formation in 18th-century France.
The Blanc Brothers and the Single Zero
The version of roulette most players would recognise today owes less to any 17th-century mathematician and more to two 19th-century brothers with a commercial problem to solve. In 1843, in the German spa town of Bad Homburg, François and Louis Blanc introduced a wheel with a single zero pocket, competing directly against rival casinos still running wheels with both a single and a double zero. Fewer zero pockets meant a lower house edge on the same bets, a genuine competitive advantage the Blancs used to draw players away from double-zero tables. This wasn't a cosmetic tweak. It restructured the game's underlying mathematics in a way that still separates European from American roulette nearly two centuries later.
When the German government moved to abolish gambling in the 1860s, the Blanc family relocated their operation to Monte Carlo, then the last legal casino operation remaining in Europe. There, the single-zero wheel became the standard game at what grew into one of Europe's best known gambling destinations, and it spread outward from Monte Carlo to casinos across the world from that point on. The double-zero wheel, meanwhile, took a different route entirely: it travelled up the Mississippi River from New Orleans and westward across the United States, becoming and remaining the standard American configuration to the present day. Two brothers solving a competitive pricing problem in a German spa town produced a mathematical split that still shows up on every roulette table's felt.
The Devil's Wheel: A Legend Worth Labelling as One
Roulette carries a nickname, "the Devil's Wheel," and a persistent story attached to it, that François Blanc struck a deal with the devil to learn the game's secrets. This is legend, not documented history, and the sources that repeat it are themselves uncertain of its origin, some noting plainly that it's unclear whether Blanc's own circle invented the tale or whether it grew up around him independently of anything he did or said. The story's staying power likely owes more to a genuine mathematical coincidence than to anything supernatural: the numbers 1 through 36 on a roulette wheel sum to exactly 666, a figure long associated in Western folklore with the biblical number of the beast. That sum is real arithmetic, not myth. What's myth is the leap from a coincidental sum to a literal deal with the devil, a story that has circulated for well over a century without ever being traced to a verifiable original source.
What a Losing Game Built a City
Monte Carlo's casino, and the single-zero wheel that helped make it famous, is sometimes told as a story of fortune, but the underlying mathematics never supported that framing for the players themselves. A single-zero wheel's house edge, lower than its double-zero rival, is still a house edge, not a path to profit for anyone playing it over time. The casino's own founding fortune came from the same mathematical certainty that has funded gambling operations since: a structural edge that pays out to the house across enough spins, regardless of any individual player's outcome on any given night.
The most famous individual exception to that mathematics is worth telling in full, because the full version undercuts the story most people know only the first half of. In 1891, an English engineer turned fraudster named Charles De Ville Wells visited Monte Carlo's casino twice and won enough, across a string of sessions, to deplete a gaming table's reserve fund, triggering the casino's own tradition of draping a black cloth over a table whose bank had been broken. Wells claimed an infallible system; contemporary newspapers were split between crediting his method and suspecting a publicity stunt or exceptional luck. A popular song, "The Man Who Broke the Bank at Monte Carlo," made him famous under that name. What the song's popularity obscured is what came next: Wells returned to Monte Carlo in January 1892 and lost roughly the same 100,000 francs back to the same tables. He was arrested the following year on unrelated fraud charges, convicted on 23 counts at the Old Bailey, and served six years in prison. Released, he went on to run a Paris investment scheme two decades before Charles Ponzi's, was caught, fled, and was imprisoned again. The song remembers the win. The mathematics, and the rest of Wells's life, remember what happened afterwards.
What Survives in Today's Game
Every roulette wheel spun today, in a casino or through an online platform, still carries the Blanc brothers' 1843 decision embedded in its structure: a European wheel with one zero pocket, or an American wheel with two, the single largest determinant of that specific wheel's house edge before a single bet is placed. The 666 sum is unchanged, since the numbers themselves haven't moved since Pascal's era fed into the game's early design. What's gone is the salon setting and the German spa town competition that originally produced the split; what remains is the mathematics that split produced, still splitting European from American tables on felt across the world nearly two hundred years later.
Sources
Wikipedia, "Roulette," accessed September 2026, covering the Pascal attribution, the Blanc brothers' 1843 introduction of the single-zero wheel at Bad Homburg, and the divergent paths of the single- and double-zero wheels into Europe and the United States respectively.
Online Roulette Australia, "The Devil's Wheel," covering the 666 sum and the François Blanc legend, presented on that page explicitly as folklore rather than documented history.
Wikipedia, "Charles Wells (gambler)," accessed September 2026, covering Wells's 1891 wins at Monte Carlo, his January 1892 losses at the same casino, and his subsequent fraud convictions in Britain and France.
Wikipedia, "Biribi," accessed September 2026, covering the game's numbers, payout structure, Casanova's account of it as a cheats' game, and its 1837 ban in France.