On this day in 1374 a sudden outbreak of St. John’s Dance causes people in the streets of Aachen, Germany, to experience hallucinations and begin to jump and twitch uncontrollably until they collapse from exhaustion.
Dancing mania was a social phenomenon that occurred primarily in mainland Europe between the 14th and 17th centuries.
It involved groups of people dancing erratically, sometimes thousands at a time. The mania affected men, women, and children, who danced until they collapsed from exhaustion.
One of the first major outbreaks was in Aachen, Germany, in 1374, and it quickly spread throughout Europe; one particularly notable outbreak occurred in Strasbourg in 1518.
Affecting thousands of people across several centuries, dancing mania was not an isolated event, and was well documented in contemporary reports.
It was nevertheless poorly understood, and remedies were based on guesswork. Generally, musicians accompanied dancers, to help ward off the mania, but this…
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