John Ernest, Duke of Saxe-Eisenach German duke (1566–1638) Parents Countess Palatine Elisabeth of Simmern-Sponheim John Frederick II of Saxony Children Johann Friedrich von Sachsen-Eisenach Siblings John Casimir, Duke of Saxe-Coburg Friedrich von Sachsen-Coburg-Eisenach Johann Friedrich IV von Sachsen-Coburg-Eisenach Partners Christine of Hesse-Kassel Elisabeth of Mansfeld-Hinterort
