About Dorothea of Schleswig-Holstein-Sonderburg-Glücksburg
Princess Dorothea of Schleswig-Holstein-Sonderburg-Glücksburg (28 September 1636 – 6 August 1689), was Duchess consort of Brunswick-Lüneburg by marriage to Christian Louis, Duke of Brunswick-Lüneburg, and Electress of Brandenburg by marriage to Frederick William, Elector of Brandenburg, the "Great Elector".