Frederick I (Danish and Norwegian: Frederik; German: Friedrich; Swedish: Fredrik; 7 October 1471 – 10 April 1533) was King of Denmark and Norway.

[3][4] Frederick was the younger son of the first Oldenburg King Christian I of Denmark, Norway and Sweden (1426–81) and of Dorothea of Brandenburg (1430–95).

[6] When his brother, King John died, a group of Jutish nobles had offered Frederick the throne as early as 1513, but he had declined, rightly believing that the majority of the Danish nobility would be loyal to his nephew Christian II.

[7] In 1524 and 1525, Frederick had to suppress revolts among the peasants in Agder, Jutland and Scania who demanded the restoration of Christian II.

The high point of the rebellion came in 1525 when Søren Norby, the governor (statholder) of Gotland, invaded Blekinge in an attempt to restore Christian II to power.

In 1526, when Lutheran Reformer Hans Tausen was threatened with arrest and trial for heresy, Frederick appointed him his personal chaplain to give him immunity.

Upon Frederick's death, tensions between Catholics and Protestants rose to a fever pitch which would result in the Count's Feud (Grevens Fejde).