The Dancing Mania was, in fact, no new disease, but well known in the Middle Ages, of which many wondrous stories were traditionally current among the people.
We learn from Histories, that the first time the Plague was felt here, which was in the Year 1485, it began in the Army, with which King Henry VII. came from France, and landed in Wales.
...and from this mass may be distinctly seen bubbles filled with noxious gas continually evolving.
‘It now struck me that there was certainly much delusion in all this, and that much must be owing to panic and imitation.’