Prince Charles of Hesse-Kassel 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.

Kassel is a city on the Fulda River in northern Hesse, in central Germany. It is the administrative seat of the Regierungsbezirk Kassel and the district of the same name, and had 201,048 inhabitants in December 2020. The former capital of the state of Hesse-Kassel, it has many palaces and parks, including the Bergpark Wilhelmshöhe, which is a UNESCO World Heritage Site. Kassel is also known for the documenta exhibitions of contemporary art. Kassel has a public university with 25,000 students (2018) and a multicultural population.