John Casimir, Duke of Saxe-Coburg Duke of Saxe-Coburg (1564–1633) Parents Countess Palatine Elisabeth of Simmern-Sponheim John Frederick II of Saxony Children Siblings John Ernest, Duke of Saxe-Eisenach Friedrich von Sachsen-Coburg-Eisenach Johann Friedrich IV von Sachsen-Coburg-Eisenach Partners Anna of Saxony Margaret of Brunswick-Lüneburg