Johann Siegmund Elector of BRANDENBURG
He married Anna Princess of Prussia, Electress of Brandenburg 30 Oct 1594 at Königsberg, Ostpreussen, Prussia . Anna Princess of Prussia, Electress of Brandenburg was born at Königsberg, Ostpreussen, Prussia 3 Jul 1576 daughter of Albrecht Friedrich, Duke of Prussia, Margrave of Brandenburg and Marie Eleonore von JÜLICH-Kleve-Berg .
Johann Siegmund Elector of Brandenburg died 23/ 2 Dec/Jan 1619/20 at Cölln an der Spree, Berlin, Brandenburg, Prussia .
Anna Princess of Prussia, Electress of Brandenburg died 30 Aug 1625 at Berlin, Brandenburg, Prussia .