In ’s fourth tale (IV, 9), Guillaume de Roussillon is a Provencal knight. When he discovers that his best friend, , is having an affair with his wife, he becomes one of the day’s unlucky lovers. In a jealous rage, he murders his friend and secretly feeds his heart to for dinner. After she commits suicide, he flees to avoid the dishonor of having been cuckolded, responsibility for Cabestanh’s death, and responsibility for his wife’s suicide.