Sibylle of Cleves German noblewoman (1512-1554) (1512–1554) Parents Maria of Jülich-Berg John III, Duke of Cleves Children John Frederick III, Duke of Saxony John Frederick II of Saxony John William, Duke of Saxe-Weimar Johann Ernst II von Sachsen Siblings Amalia of Cleves William, Duke of Jülich-Cleves-Berg Anne of Cleves Partners John Frederick I
