The title of Dauphin de Viennois descended in his family until 1349 , when Humbert II sold his seigneury , called the Dauphiné , to King Philippe VI on condition that the heir of France assume the title of `` le Dauphin '' .
The title of Dauphin of Viennois descended in his family until 1349 , when Humbert II sold his signeurie , called the Dauphiné , to King Philippe VI on condition that the heir of France assumed the title of `` le Dauphin '' .