Johann Wilhelm, Duke of Saxe-Jena (

Jena Jena () is a German city and the second largest city in Thuringia. Together with the nearby cities of Erfurt and Weimar, it forms the central metropolitan area of Thuringia with approximately 500,000 inhabitants, while the city itself has a popu ...

, 28 March 1675 –

, 4 November 1690), was a duke of Saxe-Jena. He was the youngest but sole surviving son of

Bernhard II, Duke of Saxe-Jena Bernhard II, Duke of Saxe-Jena ( Weimar, 14 October 1638 – Jena, 3 May 1678), was duke of Saxe-Jena. He was the seventh child but fourth surviving son of Wilhelm, Duke of Saxe-Weimar and Eleonore Dorothea of Anhalt-Dessau. Bernhard attende ...

by his wife Marie Charlotte, daughter of

Henry de La Trémoille Henry may refer to: People *Henry (given name) * Henry (surname) * Henry Lau, Canadian singer and musician who performs under the mononym Henry Royalty * Portuguese royalty ** King-Cardinal Henry, King of Portugal ** Henry, Count of Portugal ...

, 3rd Duke of Thouars, 2nd Duke of La Tremoille, and Prince of Talmond and Taranto.

Life

When only three years old (1678) he succeeded his father as Duke of Saxe-Jena. In accordance with the testamentary instructions of his father, his uncle, Duke Johann Ernst II of Saxe-Weimar assumed his guardianship and the regency of the duchy; when he died in 1683, another uncle, Duke Johann Georg I of Saxe-Eisenach, assumed the regency. Three years later (1686), the new regent also died, and his cousin (son of the late Duke Johann Ernst II) and brother-in-law (he was married to his eldest and only surviving sister, Charlotte Marie) Duke Wilhelm Ernst of Saxe-Weimar was appointed to the regency. As Johann Wilhelm lived only fifteen years and failed to reach adulthood, he never governed. With his death the line of the Dukes of Saxe-Jena had become extinct, and the duchy was divided between Saxe-Weimar and Saxe-Eisenach. {{DEFAULTSORT:Johann Wilhelm Of Saxe-Jena, Duke 1675 births 1690 deaths House of Wettin Dukes of Saxe-Jena 17th-century German people People of Byzantine descent People from Jena Royalty and nobility who died as children