Crowned king of Denmark/Norway March 1535 and went victorius out of the civil war finally leading the siege of Copenhagen and conquering the last rebel stand. Actually getting a lot of help from Preussia, as the rebel had Lübeck as allied.
Frederick I of Denmark and Norway, lived King of Denmark and Norway. Last Roman Catholic monarch to reign over Denmark, when subsequent monarchs embraced Lutheranism after the Reformation. Married Anna of Brandenburg, then Sophie of Pomerania.