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

Friedrich Wilhelm III. of Schleswig -Holstein -Sonderburg- Beck ( * November 4, 1723, † May 6, 1757 in front of Prague) Duke of Schleswig -Holstein -Sonderburg -Beck and Prussian colonel was also Amtshauptmann of Brandenburg an der Havel and winner of the Red Eagle.

He was the son of Friedrich Wilhelm II of Schleswig -Holstein -Sonderburg -Beck and his wife Countess Ursula Anna of Dohna- Schlobitten (* December 31, 1700, † March 17, 1761 ). He inherited after the death of his father the title Duke of Schleswig -Holstein -Sonderburg- Beck.

He was a colonel in the Prussian army and commander of the Fusilier Regiment No. 46 ( Old -Württemberg). He fell in 1757 at the Battle of Prague.

His legacy was Karl Ludwig von Schleswig -Holstein -Sonderburg -Beck because he was never married and had no children.