Saxe-Weimar-Eisenach

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(Grand) Duchy of Saxe-Weimar-Eisenach (1809–1903) (Groß-)Herzogtum Sachsen-Weimar-Eisenach Grand Duchy of Saxony (1903–1918) Großherzogtum Sachsen Free State of Saxe-Weimar-Eisenach (1918–1920) Freistaat Sachsen-Weimar-Eisenach
1809–1920
Top: Flag (1813–1897) Bottom: Flag (1897–1920) Coat of arms
Anthem: Weimars Volkslied [de]
Saxe-Weimar-Eisenach within the German Empire
Saxe-Weimar-Eisenach, shown within the Ernestine duchies
Status	State of the Confederation of the Rhine (1809–1813) State of the German Confederation (1815–1866) Federal State of the North German Confederation (1867–1871) Federal State of the German Empire (1871–1918) Federal State of the Weimar Republic (1918–1920)
Capital	Weimar
Common languages	German Thuringian dialect
Government	Absolute monarchy (1809–1816) Constitutional monarchy (1816–1918) Republic (1918–1920)
Grand Duke
• 1809–1828	Karl August (first)
• 1901–1918	William Ernest (last)
Historical era	Middle Ages
• Saxe-Eisenach and Saxe-Weimar held in personal union	1741
• Merger of Eisenach and Weimar	September 20, 1809
• Raised to grand duchy	1815
• German Revolution	1918
• Joined Thuringia	1920
Currency	Saxon thaler (to 1857) Saxon Vereinsthaler (1857–1873) German gold mark (1873–1918)
Preceded by Succeeded by Saxe-Weimar Saxe-Eisenach Thuringia
Today part of	Germany

Saxe-Weimar-Eisenach (German: Sachsen-Weimar-Eisenach) was a German state, created as a duchy in 1809 by the merger of the Ernestine duchies of Saxe-Weimar and Saxe-Eisenach, which had been in personal union since 1741. It was raised to a grand duchy in 1815 by resolution of the Congress of Vienna. In 1903, it officially changed its name to the Grand Duchy of Saxony (German: Großherzogtum Sachsen), but this name was rarely used. The grand duchy came to an end in the German Revolution of 1918–19 with the other monarchies of the German Empire. It was succeeded by the Free State of Saxe-Weimar-Eisenach, which was merged into the new Free State of Thuringia two years later.

The full grand ducal style was Grand Duke of Saxe-Weimar-Eisenach, Landgrave in Thuringia, Margrave of Meissen, Princely Count of Henneberg, Lord of Blankenhayn, Neustadt and Tautenburg.

The Saxe-Weimar-Eisenach branch has been the most genealogically senior extant branch of the House of Wettin since 1672.