John Sigismund, Elector of Brandenburg Prince-elector of the Margraviate of Brandenburg (1572–1619) Parents Catherine of Brandenburg-Küstrin Joachim Frederick, Elector of Brandenburg Children Maria Eleonora of Brandenburg Joachim Sigismund von Brandenburg George William, Elector of Brandenburg Catherine of Brandenburg Anna Sophia of Brandenburg Siblings Anne Catherine of Brandenburg August of Brandenburg Marie Eleonore von Brandenburg Ernst John George of Brandenburg Joachim of Brandenburg Albrecht Frederik van Brandenburg Christian William of Brandenburg Barbara Sophie of Brandenburg Partners Duchess Anna of Prussia
