Princess Helena Adelaide of Schleswig-Holstein-Sonderburg-Glücksburg
| Princess Helena Adelaide of Schleswig-Holstein-Sonderburg-Glücksburg | |||||
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| Princess Harald of Denmark | |||||
| Born | 1 June 1888 Grünholz, Province of Schleswig-Holstein, Kingdom of Prussia, German Empire | ||||
| Died | 30 June 1962 (aged 74) Hellerup, Denmark | ||||
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| House | Glücksburg | ||||
| Father | Friedrich Ferdinand, Duke of Schleswig-Holstein | ||||
| Mother | Princess Karoline Mathilde of Schleswig-Holstein-Sonderburg-Augustenburg | ||||
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. 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.