In July 1356 Margaret died. It left William in possession of the entire Holland-Hainaut inheritance. William did not enjoy his victory for long. In late Summer 1357 he went to England. Shortly after his return he showed signs of insanity. It became so serious that his wife and council decided to call over his younger brother Albert. The count was then locked up, first in The Hague, and then in Le Quesnoy, where he would live for 31 year more.
