Wilhelm I "the Old" Duke of BRUNSWICK-WOLFENBÜTTEL
He married Cäcilie Duchess of Brunswick-WOLFENBÜTTEL 30 May 1423 . Cäcilie Duchess of Brunswick-WOLFENBÜTTEL was born at of Berlin, Brandenburg, Prussia Abt 1407 daughter of Friedrich I Elector of Brandenburg and Elisabeth Princess of Bavaria, Electress of Brandenburg .
They were the parents of 2
children:
Wilhelm II, Duke of Brunswick-WOLFENBÜTTEL
born 1425.
Friedrich, Duke of Brunswick-WOLFENBÜTTEL
born Abt 1427.
Wilhelm I "the Old" Duke of Brunswick-WOLFENBÜTTEL died 25 Jul 1482 at Brunswick, Brunswick, Germany .
Cäcilie Duchess of Brunswick-WOLFENBÜTTEL died 4 Jan 1449 .