Sweden and Denmark–Norway signed the Treaty of Kiel, whereby Frederick VI of Denmark ceded Norway to Sweden in return for the Swedish holdings in Pomerania.

Denmark–Norway was a 16th-to-19th-century multi-national and multi-lingual real union consisting of the Kingdom of Denmark, the Kingdom of Norway, the Duchy of Schleswig, and the Duchy of Holstein. The state also claimed sovereignty over three historical peoples: Frisians, Gutes and Wends. Denmark–Norway had several colonies, namely the Danish Gold Coast, Danish India, and the Danish West Indies.

The Treaty of Kiel or Peace of Kiel was concluded between the United Kingdom of Great Britain and Ireland and the Kingdom of Sweden on one side and the Kingdoms of Denmark and Norway on the other side on 14 January 1814 in Kiel. It ended the hostilities between the parties in the ongoing Napoleonic Wars, where the United Kingdom and Sweden were part of the anti-French camp while Denmark–Norway was allied to the French Empire.

Frederick VI was King of Denmark from 13 March 1808 until his death in 1839 and King of Norway from 13 March 1808 to 7 February 1814. He was the last king of Denmark–Norway. From 1784 until his accession, he served as regent during his father's mental illness and was referred to as the "Crown Prince Regent". For his motto he chose God and the just cause. Instead of the customary latin, he used Danish, which established a precedent for later Danish kings who used Danish as well.

Pomerania is a historical region on the southern shore of the Baltic Sea in Central Europe, split between Poland and Germany. The central and eastern part belongs to the West Pomeranian, Pomeranian and Kuyavian-Pomeranian voivodeships of Poland, while the western part belongs to the German states of Mecklenburg-Western Pomerania and Brandenburg.