 Isabeau was honored in 1389 with a lavish coronation ceremony and entry into Paris . In 1392 Charles suffered the first attack of what was to become a lifelong and progressive mental illness , resulting in periodic withdrawal from government . The episodes occurred with increasing frequency , leaving a court both divided by political factions and steeped in social extravagances . A 1393 masque for one of Isabeau 's ladies @-@ in @-@ waiting — an event later known as Bal des Ardents — ended in disaster with the King almost burning to death . Although the King demanded Isabeau 's removal from his presence during his illness , he consistently allowed her to act on his behalf . In this way she became regent to the Dauphin of France ( heir apparent ) , and sat on the regency council , allowing far more power than was usual for a medieval queen . 
