Catherine of Brandenburg-Küstrin daughter of Margrave John of Küstrin (1549–1602) Parents Catherine of Brunswick-Wolfenbüttel, Margravine of Brandenburg-Küstrin John, Margrave of Brandenburg-Küstrin Children Barbara Sophie of Brandenburg John George of Brandenburg John Sigismund, Elector of Brandenburg Anne Catherine of Brandenburg Albrecht Frederik van Brandenburg Ernst Christian William of Brandenburg August of Brandenburg Joachim of Brandenburg Siblings Elisabeth of Brandenburg-Küstrin Partners Joachim Frederick, Elector of Brandenburg
