Saxe-Weimar-Eisenach (German: Sachsen-Weimar-Eisenach) was a historical 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 Vienna Congress. 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.

(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
Top: Flag
Bottom: Flag
Anthem: Weimars Volkslied
Saxe-Weimar-Eisenach within the German Empire
Saxe-Weimar-Eisenach, shown within the Ernestine duchies
StatusState of the Confederation of the Rhine
State of the German Confederation
Federal State of the North German Confederation
Federal State of the German Empire
Federal State of the Weimar Republic
Common languagesGerman
Thuringian dialect
GovernmentGrand duchy (1815–1918)
Republic (1918–1920)
Grand Duke 
Charles Augustus (first)
William Ernest (last)
Historical eraMiddle Ages
 Merger of Eisenach and Weimar
September 20, 1809
 Raised to grand duchy
 German Revolution
 Joined Thuringia
CurrencySaxon thaler (to 1857)
Saxon vereinsthaler (1857–73)
German gold mark (1873–1918)
Preceded by
Succeeded by
Today part ofGermany

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.

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