Frederick I of Denmark

Frederick I besieged Copenhagen, which remained loyal to the deposed Christian II. The city surrendered after a blockade, consolidating Frederick's control over Denmark and ending the immediate threat from his predecessor.

Frederick I was elected king after his nephew Christian II was deposed by the Danish nobility. His reign marked the end of the Kalmar Union and the beginning of a period of religious and political change.

Frederick I allowed Lutheran preaching in Denmark, protecting reformers like Hans Tausen. He did not formally break with the Catholic Church but permitted the spread of Reformation ideas, laying the groundwork for state Lutheranism.

Frederick I faced opposition from Catholic bishops who resisted his pro-Reformation policies. He convened a meeting in Copenhagen where Lutheran and Catholic representatives debated, but no resolution was reached, escalating tensions.