Charles XIII & II also Carl, (Stockholm, 7 October 1748 – Stockholm, 5 February 1818), was King of Sweden (as Charles XIII) from 1809 and King of Norway (as Charles II) from 1814 until his death. He was the second son of King Adolf Frederick of Sweden and Louisa Ulrika of Prussia, sister of Frederick II of Prussia. Though known as King Charles XIII in Sweden, he was actually the seventh Swedish king by that name, as Charles IX (reigned 1604–1611) had adopted his numeral after studying a fictitious history of Sweden.