Catherine of Brandenburg-Küstrin was a Margravine of Brandenburg-Küstrin by birth and Electress of Brandenburg by marriage.
Catherine of Brandenburg Küstrin
John Sigismund was a Prince-elector of the Margraviate of Brandenburg from the House of Hohenzollern. He became the Duke of Prussia through his marriage to Duchess Anna, the eldest daughter of Duke Al
Catherine of Brandenburg-Küstrin
…From her marriage with Joachim Frederick, Catherine had the following children: John Sigismund, Elector of Brandenburg (8 November 1572 – 23 December 1619), Elector of Brandenburg Anne Catherine (26 June 1575 – 29 March 1612…
Portrait (unknown artist, c. 1610)