Duke Johann Wilhelm of Saxe-Altenburg
|Duke John William of Saxe-Altenburg|
|Noble family||House of Wettin|
|Father||Friedrich Wilhelm I, Duke of Saxe-Weimar|
|Mother||Countess Palatine Anna Maria of Neuburg|
13 April 1600|
|Died||2 December 1632
army camp outside Brzeg
|Buried||St. Sophia Church in Dresden|
Duke Johann Wilhelm of Saxe-Altenburg (born 13 April 1600 in Torgau; died: 2 December 1632 outside Brzeg) was a member of the Ernestine branch of the House of Wettin and a titular Duke of Saxe-Altenburg and of Jülich-Cleves-Berg.
After the death of his father Johann Wilhelm inherited the Duchy of Saxe-Altenburg jointly with his brothers Johann Philipp, Friedrich and Friedrich Wilhelm II. Initially, the guardianship of the princes was taken up by the Elector of Saxony and their uncle John II. After John II died in 1605, the Elector was their sol guardian.
After the War of the Jülich Succession, the brothers had been invested with Jülich, Cleves and Berg. However, they were only nominally Dukes and took the coat of arms. In 1612, the brothers went to the University of Leipzig to complete their education. In 1618, the eldest brother Johann Philipp came of age and began to rule independently. The younger brothers agreed that he would rule alone, in exchange for a financial compensation. Initially, the agreement was for a limited number of years. In 1624, however, it was extended indefinitely. Johann Wilhelm made his Grand Tour to Italy, Holland, France, England and Hungary together with his brother Frederick William.
- E. Pasch. (1881), "Johann Wilhelm (Herzog von Sachsen-Altenburg)", Allgemeine Deutsche Biographie (ADB) (in German), 14, Leipzig: Duncker & Humblot, p. 368
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