The title "Duke of Leuchtenberg" is a noble title that originated in the 19th century. It was created in 1817 by the Russian Emperor Alexander I for Eugene de Beauharnais, the stepson of Napoleon Bonaparte. The title is associated with the Leuchtenberg family, which has ties to both Russian and European nobility. The Dukes of Leuchtenberg have played significant roles in various European courts, particularly in Russia and Germany. The family is known for its contributions to culture and politics, and the title remains a symbol of aristocratic heritage in Europe today.