Which king claimed he was made of glass and could not be touched?

Charles VI, known as "Charles the Mad" ruled France in the midst of the Hundred Years' War. He suffered from periods of mental illness, which had been passed on for several generations through his mother, Joanna of Bourbon. During an episode in 1395–96 he claimed he was Saint George and did not know his wife or children. In 1405, he refused to bathe or change clothes for five months. The entrances of his residence were walled up to keep him inside.