"Ernest I, called "Ernest the Pious" (25 December 1601 – 26 March 1675), was a duke of Saxe-Gotha and Saxe-Altenburg. The duchies were later merged into ...
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Saxe-Gotha-Altenburg.
He was the ninth but sixth surviving son of Johann II, Duke of Saxe-Weimar, and Dorothea Maria of Anhalt. His mother was a granddaughter of Christoph, Duke of Württemberg, and great-granddaughter of Ulrich, Duke of Württemberg." - (en.wikipedia.org 14.06.2020)
