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Saxe-Jena 
Summary
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.
Duchy of Saxe-Jena Herzogtum Sachsen-Jena | |||||||||
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| 1672–1690 | |||||||||
 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 | ||||||||
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Dukes of Saxe-Jena edit
- Bernhard (1672–1678)
- Johann Wilhelm (1678–1690)
Reincorporated into Saxe-Weimar