Overview
Charles August or Carl August was a Danish prince. He is best known for serving as Crown Prince of Sweden briefly in 1810, adopted by Charles XIII, before his sudden death from a stroke. Earlier, he had been a general in the Royal Danish Army as well as the Governor-general of Norway. His name before assuming the Swedish title in 1810 was Christian August of Schleswig-Holstein-Sonderburg-Augustenburg, or Christian August of Augustenburg for short.
From Wikipedia (CC BY-SA 4.0).