Dancing Plague of 1518: Strasbourg’s Wild Mystery

Picture this: it's July 1518 in Strasbourg, a bustling city in the Holy Roman Empire. Suddenly, a woman named Frau Troffea steps out onto a narrow cobbled street and starts to dance. No music. No festival. She just moves—arms thrashing, feet stomping—like she can't stop. It isn't long before people start to gather, staring, confused. But then, something even stranger happens: they join her.

This is the beginning of the Dancing Plague of 1518—one of the weirdest, most debated mass events in European history. Within a week, more than thirty people are dancing in the streets, often to the point of collapse. By August, the number grows to somewhere between 50 and 400 people, depending on which chronicler you believe. The city is gripped by a bizarre epidemic, and no one—not city leaders, not local doctors, not even the church—can make sense of it.

So, what actually happened in Strasbourg that summer? And how did a city end up with hundreds of people moving day and night until they bled through their shoes?

The background is as strange as the event itself. Medieval Europe had seen outbreaks of what was called “dancing mania” before. Similar episodes had erupted across the Rhine and Moselle river regions, and even as far back as the eleventh century in Cölbigk, Saxony, where villagers supposedly danced in a frenzy as a form of divine punishment. But Strasbourg in 1518 was different—not just for its size but for the city’s reaction.

Contemporary sources—ranging from physician’s notes to city council records—confirm the dancing happened. Eyewitnesses described participants as having vacant, glassy eyes and flailing limbs. Reports say blood pooled in their feet, and some dancers cried out for help, convinced they could not stop. There are even claims—though modern historians disagree about their reliability—that as many as fifteen people died per day from exhaustion or heart failure during the outbreak’s peak.

Nobody knew what to do. At first, Strasbourg’s city council tried to handle the plague with what seemed like common sense: let the dancers dance it out. Officials refurbished guild halls, hired musicians, and even brought in strongmen to help prop up the afflicted, believing that dance was the cure. But this only made things worse, as more people joined in—some out of fear, others out of superstition.

When secular remedies failed, the city turned to the church. One prevailing belief was that Saint Vitus, a revered figure in medieval Christianity, had cursed the dancers. The council banned music and even public dancing, hoping to stop the spread. Dancers were ordered to go on pilgrimage to the shrine of Saint Vitus. According to reports, they wore red shoes sprinkled with holy water and painted with crosses, and they carried small crosses in their hands while incense and Latin prayers were recited. Word soon spread that these rituals had worked for some, with claims that participants had been “forgiven by Vitus.” By September, the outbreak faded as remaining dancers were led to a mountaintop chapel to pray for absolution.

The conflict at the heart of the Dancing Plague is one of explanation. Historians have been arguing for centuries about what really caused it. Some claim it was a physical illness. Others argue it was psychological. Several theories have dominated the debate, each with its own problems.

One of the most famous is ergot poisoning. Ergot is a fungus that grows on rye and produces chemicals closely related to LSD, which can cause hallucinations and convulsions. Ergot poisoning, also called St. Anthony’s fire, has been blamed for everything from medieval madness to the Salem witch trials. But historian John Waller points out a key problem: ergotism usually leads to convulsions and delirium, not coordinated dancing for days or weeks. And if contaminated rye bread was the cause, why didn’t everyone who ate it go mad in the same way? Plus, outbreaks like Strasbourg’s always seemed to occur along certain rivers, regardless of local climate or crops, making a purely agricultural explanation tough to swallow.

Another leading theory is mass psychogenic illness—what used to be called “mass hysteria.” This is when psychological stress spreads physically through a community in a kind of social contagion. In 1518, Alsace was hit hard by famine, disease, and social unrest. According to John Waller, the region’s population was superstitious and deeply anxious. He argues that extreme stress and shared beliefs about divine punishment combined to trigger a trance-like state in susceptible people, which then spread like wildfire. Once enough people started dancing, the fear of Saint Vitus, the spectacle, and the panic all reinforced each other.

Still, this theory isn’t airtight. The full mechanism for how a psychological state turns into weeks-long physical compulsion—and why the city’s efforts to “dance it out” backfired so spectacularly—remains unclear.

There are even weirder theories. Some suggest that the event was the result of a secret religious cult or was staged as a kind of protest or ritual, hidden under the guise of uncontrollable mania. Historical accounts note that similar manias involved processions, colorful costumes, and elaborate rituals. In fact, some records from other outbreaks describe dancers as unable to perceive the color red, or as having violent reactions to pointed shoes. Others mention participants engaging in sexual acts, animalistic behavior, or even parading naked.

The truth is, nobody really knows what made so many people dance themselves to collapse in 1518. The debate is so fierce because the phenomenon sits right at the edge of what we can explain—part medical mystery, part social panic, part religious fervor.

Why do people still care? The Dancing Plague continues to fascinate because it blurs the lines between mind and body, belief and biology, panic and performance. Modern researchers see echoes of Strasbourg in everything from the Tanganyika laughter epidemic to social contagions and internet-driven manias. The story keeps popping up in books, films, and even songs—like the 2022 choral track “Choreomania” by Florence and the Machine, and the 2024 rap song “RATKING 1518” by Grim Salvo.

Despite centuries of research, the final death toll remains unknown. Some sources claim hundreds died, but the city’s own records don’t mention any fatalities at all. Even the identity of the first dancer is contested, with four out of six chroniclers calling her Frau Troffea, but others describing her as nameless.

In the end, what’s most haunting is that this wasn’t a one-off anomaly. Seven other major dancing plagues were reported in the same region during the medieval era. In 1278, two hundred people danced on a bridge over the River Meuse until it collapsed, sending many to their deaths. In Apulia, Italy, the so-called “tarantism” outbreaks involved convulsive dancing supposedly triggered by a spider bite, treated not with medicine but with more dancing and the right kind of music.

But in Strasbourg, the spectacle reached such proportions that centuries later, we’re still debating whether it was disease, delusion, ritual, or something stranger. The most chilling thought? According to some historians, the last dancers in 1518 were led away from the city and up the slopes to a shrine—still moving, still unable to stop, their fate lost to history.