 In December 1415 Dauphin Louis died suddenly at age 18 of illness , leaving Isabeau 's political status unclear . Her 17 @-@ year @-@ old fourth @-@ born son , John of Touraine , now the Dauphin , had been raised since childhood in the household of Duke William II of Bavaria in Hainaut . Married to Countess Jacqueline of Hainaut , Dauphin John was a Burgundian sympathizer . William of Bavaria refused to send him to Paris during a period of upheaval as Burgundians plundered the city and Parisians revolted against another wave of tax increases initiated by Count Bernard VII of Armagnac ; in a period of lucidity , Charles had raised the Count to be the Constable of France . Isabeau attempted to intervene by arranging a meeting with Jacqueline in 1416 , but Armagnac refused to allow Isabeau to reconcile with the House of Burgundy , while William II continued to prevent the young Dauphin from entering Paris . 
