Saxe-Jena John Ernest II, Duke of Saxe-Weimar (1678–1683), during the minority of his nephew, Duke Johann Wilhelm. John George I, Duke of Saxe-Eisenach (1683–1686), during the minority of his nephew, Duke Johann Wilhelm. William Ernest, Duke of Saxe-Weimar (1686–1690), during the minority of his cousin and brother-in-law, Duke Johann Wilhelm.
saxe-jena john ernest ii duke of saxe-weimar (1678–1683) during the minority of his nephew duke johann wilhelm john george i duke of saxe-eisenach (1683–1686) during the minority of his nephew duke johann wilhelm william ernest duke of saxe-weimar (1686–1690) during the minority of his cousin and brother-in-law duke johann wilhelm