Sophia Sidney, Baroness De L'Isle and Dudley
Dorothea Jordan was an Anglo-Irish actress, as well as a courtesan. She was the long-time mistress of Prince William, Duke of Clarence (later King William IV), and the mother of 10 illegitimate children by him, all of whom took the surname FitzClarence. She was known professionally as Dorothea Francis and Dorothea Jordan, was informally Dora Jordan, and she was commonly referred to as Mrs Jordan and Mrs FitzClarence. Wikipedia