Frederick William III, Duke of Schleswig-Holstein-Sonderburg-Beck

Frederick William III, Duke of Schleswig-Holstein-Sonderburg-Beck (4 November 1723 – 6 May 1757) was the Duke of Schleswig-Holstein-Sonderburg-Beck from 1749.

Early life
He was born as the first child and only son of Frederick William II, Duke of Schleswig-Holstein-Sonderburg-Beck and his second wife, Burgravine Ursula Anna of Dohna-Schlodien (1700-1761).

Biography
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 Schleswig-Holstein-Sonderburg-Beck by his uncle Charles Louis.