Johann I Margrave of BRANDENBURG-KÜSTRIN
He married Katharine Princess of Brunswick-WOLFENBÜTTEL 31 Dec 1537 . Katharine Princess of Brunswick-WOLFENBÜTTEL was born at of Wolfenbüttel, Braunschweig, Germany 1518 daughter of Heinrich II, Duke of Brunswick-WOLFENBÜTTEL and Marie Countess of WÜRTTEMBERG .
They were the parents of 2
children:
Elisabeth Princess of Brandenburg, Margravine of Ansbach
born 29 Aug 1540.
Katharine Electress of Brandenburg
born 10 Aug 1549.
Johann I Margrave of Brandenburg-KÜSTRIN died 13 Jan 1571 at Küstrin, Brandenburg, Prussia .
Katharine Princess of Brunswick-WOLFENBÜTTEL died 16 May 1574 .