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In page Princess Friederike of Schleswig-Holstein-Sonderburg-Glücksburg:

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On 6 June 1825, Duke Friedrich Wilhelm was appointed Duke of Glücksburg by his brother-in-law Frederick VI of Denmark, as the elder Glücksburg line had become extinct in 1779. He subsequently changed his title to Duke of Schleswig-Holstein-Sonderburg-Glücksburg and founded the younger Glücksburg line.[citation needed]