The Nuttall Encyclopedia
An epidemic of frequent occurrence, especially in German towns, during the Middle Ages, of the nature of hysteria, showing itself in convulsive movements beyond the control of the will, and in delirious acts, sometimes violently suicidal; the most signal occurrence of the mania was at Aix-la-Chapelle in July 1374.
Wood, James, ed. Entry for 'Dancing Mania'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/d/dancing-mania.html. Frederick Warne & Co Ltd. London. 1900.