King of Prussia, military reformer.

Frederick Augustus I (23 December 1750 – 5 May 1827) was a member of the House of Wettin who reigned as the last Elector of Saxony from 1763 to 1806 (as Frederick Augustus III) and as the first King of Saxony from 1806 to 1827.

Frederick I (11 July 1657 – 25 February 1713), of the Hohenzollern dynasty, was (as Frederick III) Elector of Brandenburg and Duke of Prussia in personal union (Brandenburg-Prussia).

Frederick William I (14 August 1688 – 31 May 1740), known as the Soldier King (Taylor, Ronald.

Frederick I (Danish and ; ; ; 7 October 1471 – 10 April 1533) was King of Denmark and Norway.

Frederick I (28 April 1676 – 5 April 1751) was King of Sweden from 1720 until his death, having been prince consort of Sweden from 1718 to 1720, and was also Landgrave of Hesse-Kassel from 1730.

Frederick Louis Maytag I (July 14, 1857 – March 26, 1937) also known as F. L. Maytag, founded the Maytag Company, which eventually became the Maytag Corporation and in turn was acquired by the Whirlpool Corporation in 2006.