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In page Princess Helena Adelaide of Schleswig-Holstein-Sonderburg-Glücksburg:

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Princess Helena Adelaide of Schleswig-Holstein-Sonderburg-Glücksburg (German: Helene Adelheid Viktoria Marie; 1 June 1888 - 30 June 1962) was the third eldest daughter of Friedrich Ferdinand, Duke of Schleswig-Holstein and his wife Princess Karoline Mathilde of Schleswig-Holstein-Sonderburg-Augustenburg.[citation needed] She was a princess of Denmark through her marriage within the House of Schleswig-Holstein-Sonderburg-Glücksburg to Prince Harald of Denmark. Princess Helena was a Nazi sympathiser during World War II and was after the war exiled from Denmark, but eventually allowed to return, where she died.