Who dated Charles XIII of Sweden?

Charles XIII or Carl XIII (Swedish: Karl XIII; 7 October 1748 – 5 February 1818) was King of Sweden from 1809 and King of Norway from 1814 to his death. He was the second son (and younger brother to King Gustav III) of King Adolf Frederick of Sweden and Louisa Ulrika of Prussia, sister of Frederick the Great.

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. In Norway, he is known as Charles II.

Henrietta Mariana "Marianne" Charlotta Koskull (19 February 1785, in Växjö – 30 March 1841, in Stockholm) was a Swedish noble and lady-in-waiting, known as the royal mistress of King Charles XIII of Sweden and King Charles XIV John of Sweden.

Countess Christina Augusta Löwenhielm (née von Fersen; 10 March 1754 – 8 April 1846), was a Swedish noblewoman and courtier. She is known for her love affair with the future king Charles XIII. She is also famous in history as one of "the three graces" of the Gustavian age; three ladies-in-waiting (Augusta von Fersen, Ulla von Höpken and Louise Meijerfeldt) immortalized in the poem Gracernas döpelse by Johan Henric Kellgren, and known profiles of the epoch.