"John Ernest II (11 September 1627, in Weimar – 15 May 1683, in Weimar), was a duke of Saxe-Weimar. He was the second but eldest surviving ...
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son of William, Duke of Saxe-Weimar, and Eleonore Dorothea of Anhalt-Dessau." - (en.wikipedia.org 16.11.2019)
