Charles XIII of Sweden vs Frederick II of Denmark

Charles XIII, as regent and later king, oversaw the conclusion of the Finnish War against Russia. The Treaty of Fredrikshamn ceded Finland to Russia, ending centuries of Swedish rule over the region.

Charles XIII was crowned King of Sweden after the deposition of Gustav IV Adolf. His coronation followed the adoption of the 1809 constitution, which established a balance of power between the king and the Riksdag.

Charles XIII, having no legitimate heirs, adopted the French Marshal Jean-Baptiste Bernadotte as his successor. Bernadotte became Crown Prince Charles John and effectively ruled Sweden, founding the Bernadotte dynasty.

Charles XIII, under the influence of Crown Prince Charles John, accepted the Treaty of Kiel and the Convention of Moss, which forced Norway into a personal union with Sweden. Charles XIII became King of Norway as Charles II.

Charles XIII died in Stockholm at age 69. His death ended the Holstein-Gottorp dynasty's rule in Sweden, as he was succeeded by his adopted son, Charles XIV John (Bernadotte).

Frederick II significantly expanded the Danish navy, building new warships and strengthening naval infrastructure. This investment made Denmark a major naval power in the Baltic Sea during his reign.

Frederick II led Denmark into the Northern Seven Years' War against Sweden. The war was inconclusive, ending with the Treaty of Stettin in 1570, which confirmed the status quo but drained Danish resources.

Frederick II signed the Treaty of Stettin ending the Northern Seven Years' War. The treaty maintained the territorial boundaries but required Sweden to pay a ransom for the fortress of

Frederick II commissioned the construction of Kronborg Castle in Helsing