The Duc de Nemours was a title held by members of the French royal family, particularly associated with the House of Orléans. The most notable Duc de Nemours was Prince Henri, Duke of Nemours, who lived in the 19th century. He was a prominent figure during the July Monarchy in France and was known for his military service and political involvement. The title itself, "Duc de Nemours," refers to the region of Nemours in France. The dukedom was created in 1830 and has historical significance, representing the connection between the French monarchy and the Orléans family. The title has since become less prominent with the decline of the monarchy in France.