Frederick William I () may refer to: *

Frederick William I, Duke of Saxe-Weimar Friedrich Wilhelm I (25 April 1562 in Weimar – 7 July 1602 in Weimar) was a duke of Saxe-Weimar. He was the eldest son of Johann Wilhelm, Duke of Saxe-Weimar and Dorothea Susanne of Simmern. Life At the time of the death of his father ...

(1562–1602) *

Frederick William, Elector of Brandenburg Frederick William (; 16 February 1620 – 29 April 1688) was Elector of Brandenburg and Duke of Prussia, thus ruler of Brandenburg-Prussia, from 1640 until his death in 1688. A member of the House of Hohenzollern, he is popularly known as "th ...

, the "Great Elector" of Brandenburg-Prussia (1620–1688) *

Frederick William I, Duke of Schleswig-Holstein-Sonderburg-Beck Frederick William I, Duke of Schleswig-Holstein-Sonderburg-Beck (German: ''Friedrich Wilhelm I. Herzog von Schleswig-Holstein-Sonderburg-Beck''; 2 May 1682 – 26 June 1719) was a son of Duke August and his wife, Countess Hedwig Louise of Li ...

(1682–1719) *

Frederick William I of Prussia Frederick William I (; 14 August 1688 – 31 May 1740), known as the Soldier King (), was King in Prussia and Elector of Brandenburg from 1713 until his death in 1740, as well as Prince of Neuchâtel. Born in Berlin, he was raised by the Hugu ...

(1688–1740) *

Frederick William, Elector of Hesse Frederick William I (20 August 1802 – 6 January 1875) was, between 1847 and 1866, the last Prince-elector of Hesse-Kassel (or Hesse-Cassel). Early life He was born at Hanau on 20 August 1802. He was the son of Prince William, later William ...

(1802–1875)

See also