Johann II, Duke of Saxe-Weimar was a Duke of Saxe-Weimar and Jena.
Ernest I, Duke of Saxe-Gotha
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Ernest I, called Ernest the Pious, was duke of Saxe-Gotha and Saxe-Altenburg, later united as Saxe-Gotha-Altenburg. He was a surviving son of Johann II, Duke of Saxe-Weimar and Dorothea Maria of Anhal
Statue of Ernest I in front of Friedenstein Castle in Gotha
Engraving of Ernest I