Saxe-Jena - Wikipedia

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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 (German)

1672–1690