The Duchy of Saxe-Jena was one of the Saxon Duchies held by the Ernestine line of the Wettin Dynasty. Established in 1672 for Bernhard, fourth son of Wilhelm, Duke of Saxe-Weimar, Saxe-Jena was reincorporated into Saxe-Weimar on the extinction of Bernhard's line in 1690.

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Quick Facts Duchy of Saxe-JenaHerzogtum Sachsen-Jena, Status ...

Duchy of Saxe-Jena Herzogtum Sachsen-Jena
1672–1690
Coat of arms
Saxe-Jena, shown with the other Ernestine duchies
Status	State of the Holy Roman Empire
Capital	Jena
Government	Principality
Historical era	Middle Ages
• Partitioned from     Saxe-Weimar	1672
• Ducal line extinct;     restored to Saxe-Weimar	1690
Preceded by Succeeded by Saxe-Weimar Saxe-Weimar

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• Bernhard (1672–1678)
• Johann Wilhelm (1678–1690)

Reincorporated into Saxe-Weimar