Frederik I may refer to: *

Frederick I of Denmark Frederick I ( Danish and ; ; ; 7 October 1471 – 10 April 1533) was King of Denmark and Norway. He was the last Roman Catholic monarch to reign over Denmark and Norway, when subsequent monarchs embraced Lutheranism after the Protestant Refor ...

(1471–1533) *

Frederick I of Sweden Frederick I ( sv, Fredrik I; 28 April 1676 – 5 April 1751) was prince consort of Sweden from 1718 to 1720, and King of Sweden from 1720 until his death and (as ''Frederick I'') also Landgrave of Hesse-Kassel from 1730. He ascended the thron ...

(1676–1751)

See also