onquered repeatedly. The issue was for practical purposes resolved on 17 June 1523, as Swedish King Gustav Vasa conquered the city of Stockholm.
The Protestant Reformation came to Scandinavia in the 1530s, and following the Count's Feud civil war, Denmark converted to Lutheranism in 1536. Later that year, Denmark entered into a union with Norway.
Early modern history
After Sweden permanently broke away from the Kalmar Union in 1523, Denmark tried on two occasions to reassert control over Sweden. The first was in the Northern Seven Years War which lasted from 1563 until 1570. The second occasion was the Kalmar War when King Christian IV attacked Sweden in 1611 but failed to accomplish his main objective of forcing Sweden to return to the union with Denmark. The war led to no territorial changes, but Sweden was forced to pay a war indemnity of 1 million silver riksdaler to Denmark, an amount known as the Älvsborg ransom.
King Christian used this money to found several towns and fortresses, most notably Glückstadt (founded as a rival to Hamburg), Christiania (following a fire destroying the original city of Oslo), Christianshavn, Christianstad and Christiansand. Christian also constructed a number of buildings, most notably Børsen, Rundetårn, Nyboder, Rosenborg, a silver mine and a copper mill. Inspired by the Dutch East India Company, he founded a similar Danish company and planned to claim Ceylon as a colony, but the company only managed to acquire Tranquebar on India's Coromandel Coast. Denmark's large colonial aspirations were limited to a few key trading posts in Africa and India.
In the Thirty Years' War, Christian tried to become the leader of the Lutheran states in Germany but suffered a crushing defeat at the Battle of Lutter. The result was that the Catholic army under Albrecht von Wallenstein was able to invade, occupy and pillage Jutland, forcing Denmark to withdraw from the war. Denmark managed to avoid
