Her marriage to Louis Philippe Joseph d'Orléans , Duke of Chartres , son of the Duke of Orléans , had been envisaged earlier and , while the Duke of Penthièvre saw in it the opportunity for his daughter to marry the First Prince of the Blood Royal , the Orléans did not want a union with an illegitimate branch of the royal family .
Her marriage to Louis Philippe Joseph d'Orléans , Duke of Chartres , son of the Duke of Orléans , had been envisaged earlier and , while the Duke of Penthièvre saw in it the opportunity for his daughter to marry into the family of the First Prince of the Blood , the Orléans did not want a union with an illegitimate branch of the royal family .