The Strasbourg Dancing Plague

I found the key to the roll-top desk inside her sewing basket, buried under tangled hanks of green wool. It felt too simple, like a child’s game she forgot to finish. The desk sits in the small, windowless room directly beneath the attic joists—the one she always kept padlocked during my teenage years, claiming it held old tax records and water-damaged upholstery. It doesn’t. It holds six steel filing drawers, heavy and olive-drab, smelling faintly of vinegar and old starch. The first drawer is labeled CONTAGION in her neat, drafting-pen hand. Inside, wrapped in yellowed legal-cap paper, is the flagship dossier. On the very first page, she wrote a single warning in red ink: “DO NOT READ THE DOSSIERS OUT LOUD.”

I am a historian. Or, at least, I was three weeks ago before I came back to close this estate down. I know how to read a source. I know how to separate the panic of the past from the reality of the record. The document she compiled here is sober, almost dry, drawing from municipal chronicles of the Holy Roman Empire. It concerns the summer of 1518 in the free city of Strasbourg.

On July 14, 1518, a woman identified in the records as Frau Troffea stepped onto a narrow, cobbled street outside her home. She began to dance. There was no musical accompaniment, no festival, no apparent provocation. She simply moved her limbs in a frantic, rhythmic pattern that did not stop. She danced for days, collapsing from sheer exhaustion only to resume the moment her muscles twitched back to life. Within a single week, approximately thirty others had joined her. By August, the crowd of compulsive dancers had swollen to between 50 and 400 individuals.

The city authorities—the council members and local physicians—scrambled to find a secular explanation. They rejected supernatural intervention, diagnosing the affliction as a physical ailment caused by “hot blood.” In an attempt to cure the dancers, the city made a disastrous decision: they constructed wooden stages and hired professional musicians, believing that if the afflicted continued to move, they would eventually “dance the sickness out.” It failed. The dancers moved with glassy, distant eyes, their shoes filling with blood from their split, bruised feet. The epidemic did not subside until September 1518.

Modern historians like John Waller have largely dismissed the common theory of ergot poisoning, noting that the sustained, coordinated motor activity of the Strasbourg dancers does not align with the convulsant symptoms of ergotism. Instead, the consensus points to a severe mass psychogenic illness, triggered by intense localized stress. While contemporary chronicles claim high daily death rates—some alleging up to fifteen deaths per day—modern historians contest these figures as exaggerations. The exact number of casualties remains unverified.

The dossier is laid out across the desk now. There is no dust on it; she must have been organizing these files until her final week in the hospital. I have set up the modem Lukas sent me, the heavy black box with its red indicators. It is 03:00. The house is perfectly silent, except for a faint, rhythmic clicking somewhere behind the plaster, like a typewriter carriage returning in an empty room. The air under the eaves has gone remarkably cold for a July midnight, a dry, metallic chill that makes my fingers stiffen as I type. I am sending this to Lukas over the line now. If it only exists here, it doesn’t exist.

>>> BEGIN CAPTURE
FILE CONTAGION/1518/STR-008
SUBJECT: strasbourg, summer 1518.
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july 14. frau troffea steps into the street and
begins to dance. no music. no festival. no cause
the record will name. she does not stop.
within a week, thirty more. by august, between
fifty and four hundred.
the council rules it a sickness of hot blood.
they build stages. they hire musicians. they
decide the cure is more of the disease.
shoes filling with blood. eyes gone glassy and
far away. it does not break until september.
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M. NOTE (red ink, first page):
DO NOT READ THE DOSSIERS OUT LOUD
>>> END CAPTURE