THE DANCING PLAGUE OF 1518

THE CLAIM

In the summer of 1518, dozens — by some accounts hundreds — of ordinary citizens of Strasbourg danced uncontrollably for days and weeks on end, some allegedly until they died, and nobody then or since has been able to say why.

WHAT IS KNOWN

The event itself is not folklore. It appears in contemporary chronicles, physician's notes, sermons, and the records of the Strasbourg city council, which had to manage it as a municipal crisis. Sometime in mid-July 1518 a woman known to the record as Frau Troffea stepped into the street and began to dance. She continued for days. Within a week others had joined her; within a month the afflicted reportedly numbered in the hundreds. Witnesses describe something that did not look like celebration — exhausted people, apparently unable to stop.

The city's response is one of history's great cautionary tales in crisis management. Advised that the dancers suffered from "hot blood" and would recover only by dancing it out, the authorities cleared guild halls, erected a stage, and hired musicians to keep the afflicted moving. The dancing, unsurprisingly, spread. The council eventually reversed course, banned public music and dancing, and sent the dancers to the shrine of St. Vitus — the saint whose curse was popularly believed to cause the condition — where the epidemic gradually burned out by early autumn. Later chronicles claim the plague killed as many as fifteen people a day at its height; the surviving contemporary sources do not clearly corroborate a death toll, and the bureau treats the mortality figures as unverified. Similar outbreaks of dancing mania are recorded in the Rhine and Mosel regions going back to at least 1374 — 1518 was the largest and best documented, not the first.

LEADING THEORIES

• Ergot poisoning. The perennial favorite: ergotism, from fungus-contaminated rye, can cause convulsions and hallucinations. The problem is pharmacological — ergotism restricts blood flow and produces spasms, not coordinated dancing sustained for days. Most specialists now rate this weak.
• Mass psychogenic illness. The leading account, argued most fully by historian John Waller: 1518 Strasbourg was a population under extreme stress — famine, disease, and a deep cultural belief that St. Vitus could inflict a dancing curse. In mass psychogenic illness, expectation does the work: people who believed the curse was upon them danced, and the city's decision to showcase the dancers spread the expectation.
• A religious cult or deliberate ritual. Proposed historically, but the sources describe distress and compulsion, not devotion, and the council treated it as an affliction rather than heresy.

ASSESSMENT

Open, with a strong lead. That the event occurred is as certain as anything gets at five centuries' distance; the file's live question is mechanism. The psychogenic account fits the documented facts better than its rivals — it explains the spread, the role of belief, the effect of the authorities' stage-and-musicians blunder, and the eventual resolution at the shrine — but a 508-year-old outbreak cannot be examined, so it remains the best inference rather than a finding. The stamp stays open on the honest grounds that the leading theory is unfalsifiable at this range. The bureau's operational takeaway survives either way: when managing a contagion of behavior, do not build it a stage.

FURTHER READING

• Wikipedia: Dancing plague of 1518
• John Waller, A Time to Dance, a Time to Die (2008)
• Wikipedia: Mass psychogenic illness