John William III, Duke of Saxe-Eisenach (17 October 1666 – 14 January 1729), was a duke of Saxe-Eisenach, and came from the Ernestine line of the House of Wettin.

Life

John William III was born in Friedewald, the third son of John George I, Duke of Saxe-Eisenach and Johannetta of Sayn-Wittgenstein. His twin brother, Maximilian, died at the age of two. He succeeded his brother John George II as duke of Saxe-Eisenach when he died childless in 1698. John William III was crowned duke of Saxe-Eisenach. Saxe-Eisenach experienced a cultural boon under his reign, which was in no small part due to the duke's court band, whose most prominent member was Georg Philipp Telemann.

Family

In Oranjewoud on 28 November 1690, John William married with Amalie (The Hague, 25 November 1655 – Allstedt, 16 February 1695), a daughter of William Frederick, Prince of Nassau-Dietz. They had two children: In Wolfenbüttel on 27 February 1697 — two years of the death of his first wife — John William married secondly with Christine Juliane of Baden-Durlach, a daughter of Charles Gustav of Baden-Durlach. They had seven children: In Weissenfels on 28 July 1708 — one year after the death of his second wife — John William married thirdly with Magdalene Sibylle of Saxe-Weissenfels, a daughter of Johann Adolf I, Duke of Saxe-Weissenfels. They had three children: In the Schloss Philippsruhe on 29 May 1727 — one year after the death of his third wife — John William married fourthly with Marie Christine Felizitas of Leiningen-Dagsburg-Falkenburg-Heidesheim, Dowager Princess of Baden-Durlach. This union was childless. John William died at Eisenach.