The Grand Duke of Saxe-Weimar-Eisenach was a title held by the rulers of the German state of Saxe-Weimar-Eisenach. This duchy existed from the early 19th century until the end of the German monarchy in 1918. The Grand Dukes played a significant role in the cultural and political life of the region, promoting arts and education. The most notable Grand Duke was Carl August, who reigned from 1775 to 1828. Under his leadership, Weimar became a center for German literature and philosophy, attracting famous figures like Johann Wolfgang von Goethe and Friedrich Schiller. The duchy was known for its contributions to the cultural heritage of Germany.