king of france thought he was made of glass
Charles VI of France From then on, Charles' bouts of insanity became more frequent and of longer duration. During these attacks, he had delusions, believing he was made of glass or denying he had a wife and children.[1] He could also attack servants or run until exhaustion, wailing that he was threatened by his enemies. Between crises, there were intervals of months during which Charles was relatively sane.[1] However, unable to concentrate or make decisions, political power was taken away from him by prominent French nobles who were also his close relatives (the princes of the blood), whose rivalries and disputes would cause much chaos and conflict in France.