Prince Charles of Hesse-Kassel (, German and ; 19 December 1744 – 17 August 1836) was a cadet member of the house of Hesse-Kassel and a Danish general field marshal. Brought up with relatives at the Danish court, he spent most of his life in Denmark, serving as royal governor of the twin duchies of Schleswig-Holstein from 1769 to 1836 and commander-in-chief of the Norwegian army from 1772 to 1814.
Early life
Charles was born in Kassel on 19 December 1744 as the second surviving son of Hesse-Kassel's then hereditary prince, the future Frederick II, Landgrave of Hesse-Kassel and his first wife Princess Mary of Great Britain. His mother was a daughter of King George II of Great Britain and Princess Caroline of Brandenburg-Ansbach and a sister of Queen Louise of Denmark.
His father, the future landgrave (who reigned from 1760 and died in 1785), left the family in 1747 and converted to Catholicism in 1749. In 1755 he formally ended the marriage with Mary. The grandfather, William VIII, Landgrave of Hesse, granted the county of Hanau and its revenues to Mary and her sons.
The young Prince Charles and his two brothers, William and Frederick, were raised by their mother and fostered by Protestant relatives since 1747.
In 1756, Mary moved to Denmark to look after her sister, Queen Louise of Denmark's children. She took her own children with her and they were raised at the royal court at Christiansborg Palace in Copenhagen. The Hessian princes later remained in Denmark, becoming important lords and royal functionaries. Only the eldest brother William returned to Hesse, in 1785, upon ascending the landgraviate.
Early career
Charles began a military career in Denmark. In 1758 he was appointed colonel, at the age of 20 major general and in 1765 was put in charge of the artillery. After his cousin, King Christian VII, acceded to the throne in 1766, he was appointed lieutenant general, commander of the Royal Guard, knight of the Order of the Elephant and member of the Privy Council.
In 1766, he was appointed Governor-General of Norway as successor to Jacob Benzon (1688–1775). He held the position until 1770 but which remained mostly titular, as he never went to Norway during this period.
In 1763, his elder brother William married their first cousin, Danish Princess Caroline. Charles followed suit on 30 August 1766 at Christiansborg Palace — his wife was Louise of Denmark, and Charles thus became brother-in-law to his cousin, King Christian VII of Denmark. The marriage took place despite advice given against it, due to many accusations of debauchery by Prince Charles and the poor influence he had on the King.
Shortly after, Charles fell into disfavour at court, and in early 1767 he and Louise left Copenhagen to live with his mother in the county of Hanau. They would have their first child, Marie Sophie, there in 1767 and then their second child, William, in 1769.
In 1768, Charles purchased the landed property and village of Offenbach-Rumpenheim from the Edelsheim family. In 1771 he had the manor expanded into a castle and princely seat. His mother Mary lived in the palace until her death in 1772. In 1781, Charles sold the Rumpenheim Castle to his younger brother, Frederick.
Governor of Schleswig-Holstein
In 1769, Prince Charles of Hesse was appointed royal Governor of the twin duchies of Schleswig and Holstein (initially only the royal share, so-called Holstein-Glückstadt before in 1773 the king also acquired the ducal share in Holstein) on behalf of the government of his brother-in-law, King Christian VII of Denmark and Norway. Charles took up residence at Gottorp Castle in Schleswig with his family. They would have their third child Frederick there in 1771.
In 1770, King Christian VII gave his sister the estate of Tegelhof in Güby between the City of Schleswig and Eckernförde. From 1772 to 1776, Charles had a summer residence constructed on the site which he named Louisenlund in honour of his wife.
Commander-in-chief of the Norwegian army
In September 1772, Charles was appointed commander-in-chief of the Norwegian army and he and Louise moved to Christiana. The assignment was a consequence of the coup d'état of King Gustav III of Sweden on 19 August 1772 and the subsequent prospect of war with Sweden. While in Norway, Princess Louise gave birth to their fourth child Juliane in 1773. Even though Charles returned to Schleswig-Holstein in 1774, he continued to function as commander-in-chief of the Norwegian army until 1814. At the time of his return from Norway, he was appointed field marshal.