 When Philippe was born, his uncle Louis XIV was at the height of his power.In 1676, the Duke of Valois died at the Palais-Royal in Paris, making Philippe the new heir to the House of Orléans; the future heirs of the Duke of Orléans would be known as the Duke of Chartres ("duc de Chartres") for the next century.His distraught mother was pregnant at the time with Élisabeth Charlotte d'Orléans (1676–1744), future Duchess and regent of Lorraine.