Charles August, Crown Prince of Sweden

Charles August
Crown Prince of Sweden
Charles August as Crown Prince of Sweden
Predecessor	Crown Prince Gustav of Sweden (vacant since 1809)
Successor	Crown Prince Charles John (vacant until late 1810)
Born	(1768-07-09)9 July 1768 Augustenborg Palace, Augustenborg, Denmark
Died	28 May 1810(1810-05-28) (aged 41) Kvidinge, Sweden
Burial	Riddarholmen Church
House	Schleswig-Holstein-Sonderburg-Augustenburg
Father	Friedrich Christian I, Duke of Schleswig-Holstein-Sonderburg-Augustenburg
Mother	Charlotte of Schleswig-Holstein-Sonderburg-Plön

Charles August or Carl August (9 July 1768 – 28 May 1810) 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 stroke. Earlier, he had been a general in the Royal Danish Army as well as the Danish Governor-general of Norway. His name before assuming the Swedish title in 1810 was Christian August of Schleswig-Holstein-Sonderburg-Augustenborg; Christian August of Augustenborg for short.

He was born at Augustenborg Palace in July 1768 as the son of Friedrich Christian I, Duke of Schleswig-Holstein-Sonderburg-Augustenburg (1721–1794) and Princess Charlotte of Schleswig-Holstein-Sonderburg-Plön (1744–1770). He was a younger brother of Frederik Christian II, Duke of Augustenborg, brother-in-law of Princess Louise Auguste of Denmark and an uncle of Caroline Amalie of Augustenburg, Queen consort of Denmark and Christian August, Duke of Augustenborg. He did not marry.

Christian August studied in Leipzig, and returned from there to Denmark in 1785. He was appointed Lieutenant Colonel, and was promoted to Colonel in 1787 and Major General in 1790. From 1797 he was stationed in Austria, joining the fight against Napoleon. He left Austria when the Treaty of Lunéville ended the War of the Second Coalition in 1801. In 1803 Christian August was named commander of Fredriksten Fortress in Norway, assuming the position in 1804.