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 and since the time of his reign, succeeding Danish monarchs have also chosen mottos in the Danish language rather than the formerly customary Latin.

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, the Nicobar Islands, Serampore, Tharangambadi, and the Danish West Indies. The union was also known as the Dano-Norwegian Realm, Twin Realms (Tvillingerigerne) or the Oldenburg Monarchy (Oldenburg-monarkiet).