Copenhagen is surrounded by the army of Frederick I of Denmark, as the city will not recognise him as the successor of Christian II of Denmark.

Copenhagen is the capital and most populous city in the Kingdom of Denmark, with a population of 1.4 million in the urban area. The city is situated on the islands of Zealand and Amager, separated from Malmö, Sweden, by the Øresund strait. The Øresund Bridge connects the two cities by rail and road.

Frederick I was King of Denmark and Norway. He was the last Catholic monarch to reign over Denmark and Norway, when subsequent monarchs embraced Lutheranism after the Protestant Reformation. As king of Norway, Frederick is most remarkable in never having visited the country and was never crowned as such. Therefore, he was styled King of Denmark, the Vends and the Goths, elected King of Norway. Frederick's reign began the enduring tradition of calling kings of Denmark alternately by the names Christian and Frederick.

Christian II, a monarch under the Kalmar Union, reigned as King of Denmark and Norway from 1513 until 1523. He was briefly King of Sweden from 1520 until 1521. As king of Denmark and Norway, he was concurrently Duke of Schleswig and Holstein in joint rule with his uncle Frederick.