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The Duchy of Saxe-Weimar-Eisenach (Herzogtum von Sachsen-Weimar-Eisenach) was created in 1809 by the merger of the Duchies of Saxe-Weimar and Saxe-Eisenach, which had been in personal union since 1741, when the Saxe-Eisenach line had died out. It became a Grand Duchy in 1815. In 1877, it officially changed its name to the Grand Duchy of Saxony (Großherzogtum von Sachsen), but this name was rarely used. The Grand Duchy came to an end in 1918 with the other German monarchies, and the state was merged into the new state of Thuringia two years later.
Saxe-Weimar-Eisenach had an area of 3,617 km² and a population of 388,000 (1905). Its capital was Weimar.