 After the onset of the King 's illness , a common belief was that Charles ' mental illness and inability to rule were due to Isabeau 's witchcraft ; as early as the 1380s rumors spread that the court was steeped in sorcery . In 1397 Orléans ' wife , Valentina Visconti , was forced to leave Paris because she was accused of using magic . The court of the " mad king " attracted magicians with promises of cures who were often used as political tools by the various factions . Lists of people accused of bewitching Charles were compiled , with Isabeau and Orléans both listed . 
