Gustavus IV (1778–1837)

King of Sweden from 1792. He joined the Northern powers (1800), changed sides to the Bourbons (1803) and subsequently allied himself with the coalition against Napoleon. By the end of 1808 it was clear that Gustavus was insane, and in May 1809 he was deposed. He died in Switzerland in 1837.

He was born in Stockholm, the son of Gustavus III. In 1807 he refused the terms offered him by Napoleon, thus losing Rugen and Stralsund, while in 1808 Russia invaded and annexed Finland.