The Duke of Chartres was a title held by members of the French royal family, particularly during the 18th and 19th centuries. The title is associated with the region of Chartres, located southwest of Paris. The most notable Duke of Chartres was Louis-Philippe, who later became King of the French in 1830. The title has historical significance, as it was often linked to the broader context of the French monarchy and its changes over time. The Duke of Chartres played a role in the political landscape of France, especially during the tumultuous periods of the French Revolution and the subsequent establishment of the July Monarchy.