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Friedrich Wilhelm, Duke of Schleswig-Holstein-Sonderburg-Glücksburg was a German-Danish prince and officer who was the Duke of Schleswig-Holstein-Sonderburg-Beck from 1816 to 1825, and the Duke of Schleswig-Holstein-Sonderburg-Glücksburg from 1825 to 1831. Friedrich Wilhelm is the progenitor of the House of Glücksburg.
Image: Albert Emil Kirchner (1813-??), Public domain · Text from Wikipedia, CC BY-SA 4.0