Sophie of Brandenburg (1541-1564) (1541–1564) Parents Hedwig Jagiellon, Electress of Brandenburg Joachim II Hector, Elector of Brandenburg Children Siblings John George, Elector of Brandenburg Frederick of Brandenberg Hedwig of Brandenburg, Duchess of Brunswick-Wolfenbüttel Sigismund of Brandenburg Barbara of Brandenburg, Duchess of Brieg Elisabeth Magdalene von Brandenburg Partners William of Rosenberg