|Frederick William III, Duke of Schleswig-Holstein-Sonderburg-Beck|
|Born||4 November 1723|
|Died||6 May 1757 (aged 33)|
Frederick William III, Duke of Schleswig-Holstein-Sonderburg-Beck (4 November 1723 – 6 May 1757) was a son of Frederick William II and his wife, Ursula Anna of Dohna. He succeeded his father as Duke of Beck in 1749.
Frederick William was a recipient of the Order of the Red Eagle. He served as a colonel in the Prussian Army and was commander of the Füsilier Regiments No. 46 (Old-Württemberg). During the Seven Years' War, he fell in the Battle of Prague in 1757. He was unmarried and childless; he was succeed as Duke of Beck by his uncle Charles Louis.
- Gottlob Friedrich Krebel, M. Gottlieb Schumanns genealogisches Hand-Buch, S.272, 
Frederick William III, Duke of Schleswig-Holstein-Sonderburg-Beck
House of OldenburgBorn: 4 November 1723 Died: 6 May 1757
Frederick William II
|Duke of Schleswig-Holstein-Sonderburg-Beck
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