Answer:
The dancing plague of 1518 was an event in which hundreds of citizens of Strasbourg (then a free city within the Holy Roman Empire, now in France) danced uncontrollably and apparently unwillingly for days on end; the mania lasted for about two months before ending as mysteriously as it began.
It was a case of dancing mania that occurred in Strasbourg, Alsace (now France), in the Holy Roman Empire from July 1518 to September 1518. Somewhere between 50 and 400 people took to dancing for weeks
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