"From Italy it spread to ... Prussia, and one morning, without warning, the streets were filled... They danced together, ceaselessly, for hours or days, and in wild delirium, the dancers collapsed and fell to the ground exhausted, groaning and sighing as if in the agonies of death. When recuperated, they swathed themselves tightly with cloth around their waists and resumed their convulsive movements. They contorted their bodies, writhing, screaming and jumping in a mad frenzy. One by one they fell from exhaustion...
Many later claimed that they had seen the walls of heaven split open and that Jesus and the Virgin Mary had appeared before them."