Who was XXX's mother?
Philippine Élisabeth d'Orléans
Philippine Élisabeth d'Orléans known as Mademoiselle de Beaujolais (Philippine Élisabeth Charlotte; 18 December 1714 -- 21 May 1734) was the daughter of Philippe d'Orléans, duc d'Orléans (Regent from 1715 to 1723) and his wife, Françoise-Marie de Bourbon, the youngest legitimised daughter of King Louis XIV and his mistress, Madame de Montespan.