Catherine of Brandenburg-Küstrin was a Margravine of Brandenburg-Küstrin by birth and Electress of Brandenburg by marriage. Wikipedia
Born: August 10, 1549, Kostrzyn nad Odrą, Poland
Died: September 30, 1602 (age 53 years), Cölln, Germany
Great grandchildren: Frederick William, Elector of Brandenburg, Princess Anna Sophie of Denmark, Princess Louise Charlotte of Brandenburg, and more
Great-grandparents: John Cicero, Elector of Brandenburg, Margaret of Thuringia, John, King of Denmark, and more
Children: Barbara Sophie of Brandenburg, Anne Catherine of Brandenburg, Ernst, and more
Grandchildren: George William, Elector of Brandenburg, Catherine of Brandenburg, Frederick III of Denmark, and more