Frederick VI (Danish and Norwegian: Frederik; 28 January 1768 – 3 December 1839) was King of Denmark from 13 March 1808 to 3 December 1839 and King of Norway from 13 March 1808 to 7 February 1814. From 1784 until his accession, he served as regent during his father's mental illness and was referred to as the "Crown Prince Regent" (kronprinsregent). Frederick was born at Christiansborg Palace in Copenhagen. Frederick belonged to the House of Oldenburg. His parents were King Christian VII and Caroline Matilda of Great Britain. He was born after 15 months of marriage, a day before his father's 19th birthday, when his mother was just 16. As the eldest son of the ruling king, he automatically became crown prince at birth. On 30 January of the same year, he was baptised at Christiansborg Palace by Ludvig Harboe, Bishop of Zealand. On 8 January 1772, after the revolt against Struensee, Frederick's 18-year-old half-uncle Hereditary Prince Frederick was made regent. The real power, however, was held by Hereditary Prince Frederick's mother (Crown Prince Frederick's step-grandmother), Queen Dowager Juliana Maria, aided by Ove Høegh-Guldberg. Frederick was raised under the supervision of Margrethe Marie Thomasine Numsen. Finally, on 14 April 1784, the crown prince Frederick was declared of legal majority; he proceeded to seize and exercise the full powers of the regency, dismissing the ministers loyal to the Queen Dowager. It is said that during the coup, he engaged in a fistfight with his half-uncle over the regency. He continued as regent of Denmark under his father's name until the latter's death in 1808. During the regency, Frederick instituted widespread liberal reforms with the assistance of Chief Minister Andreas Peter Bernstorff, including the abolition of serfdom in 1788. Crises encountered during his reign include disagreement with the British over neutral shipping. This resulted in two British attacks on Copenhagen, the Battle of Copenhagen of 1801 and the Battle of Copenhagen of 1807. The conflict continued in the Gunboat War between Denmark-Norway and the United Kingdom, which lasted until the Treaty of Kiel in 1814. Frederick became King of Denmark-Norway on 13 March 1808. When the throne of Sweden seemed likely to become vacant in 1809, Frederick was interested in being elected there as well. Frederick actually was the first monarch of Denmark and Norway to descend from Gustav I of Sweden, who had secured Sweden's independence in 1520s after the period of the Kalmar Union with other Scandinavian countries. However, Frederick's brother-in-law, Prince Christian Augustus of Augustenborg, was first elected to the throne of Sweden, followed by the French Marshal Bernadotte.

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