Frederick I of Denmark vs Henry I of France

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.

Henry I succeeded his father Robert II as King of the Franks. His reign was marked by constant conflicts with powerful nobles, including his brother Robert I, Duke of Burgundy, who challenged his authority.

Henry I faced a rebellion led by his brother Robert I, Duke of Burgundy, who claimed the throne. The conflict lasted several years and was resolved through a compromise, with Robert retaining Burgundy but recognizing Henry as king.

Henry I allied with William, Duke of Normandy (later William the Conqueror), to suppress a rebellion in Normandy. The alliance helped William secure his duchy, but later soured, leading to conflict between the two.

Henry I fought a series of wars against the County of Anjou under Count Geoffrey Martel. The conflicts weakened royal authority and allowed Anjou to expand its territory at the expense of the crown.