John Frederick I Elector of Saxony and Head of the Protestant Confederation of Germany (1503-1554) (1503–1554) Parents Sophie of Mecklenburg John, Elector of Saxony Children John Frederick III, Duke of Saxony John Frederick II of Saxony Johann Ernst II von Sachsen John William, Duke of Saxe-Weimar Siblings Maria of Saxony, Duchess of Pomerania John Ernest, Duke of Saxe-Coburg Margaret von Sachsen Johann von Sachsen Partners Sibylle of Cleves
