He was a member of the House of Schleswig-Holstein-Sonderburg-Glücksburg , a branch of the House of Oldenburg , and had been a prince of Greece and Denmark .
In April 1952 , Queen Elizabeth II said that her descendants will keep name and House of Windsor , the House of Schleswig-Holstein-Sonderburg-Glücksburg through their father , born Prince Philip of Greece and Denmark , a line of the House of Oldenburg .