Guy of Thouars, regent of Brittany

Guy of Thouars was Duke of Brittany from 1199 to 1201 as the third husband of Constance, Duchess of Brittany. They married in Angers, County of Anjou, between August and October 1199 after her son Arthur entered Angers to be recognized as count of the three countships of Anjou, Maine and Touraine. He was an Occitan noble, a member of the House of Thouars.