Which King of Sweden and Norway had a mistress named Jacquette Löwenhielm?
Jacquette Löwenhielm: Gustava Charlotta "Jacquette" Aurora Gyldenstolpe (4 July 1797 – 7 January 1839, Constantinople) was a Swedish noble and lady-in-waiting. Jacquette Löwenhielm:  She is known as the mistress of Oscar I of Sweden in circa 1819-1827. Oscar I of Sweden: Oscar I (born Joseph François Oscar Bernadotte; 4 July 1799 – 8 July 1859) was King of Sweden and Norway from 8 March 1844 until his death.
Oscar I of Sweden