Frederick William I, Duke of Schleswig-Holstein-Sonderburg-Beck was a son of Duke August and his wife, Countess Hedwig Louise of Lippe-Alverdissen (1650-1731). He succeeded his father as Duke of Schleswig-Holstein-Sonderburg-Beck in 1689.
- Occupation
- aristocrat, military personnel
- Citizenship
- Germany
- Born
- May 2, 1682
- Died
- June 16, 1719
