Lady Mary Fox Lady Mary Fox Lady Mary Fox (née FitzClarence; 19 December 1798 – 13 July 1864) was an illegitimate daughter of King William IV of the United Kingdom by his mistress Dorothea Jordan. In later life she became a writer. Mary FitzClarence was born in Bushy House as the fourth child and second daughter of the then Prince William, Duke of Clarence, and his companion Dorothea Jordan. She was "a fine looking, brown girl with a pleasant countenance and manners". In 1820, her younger sister Elizabeth was courted by Charles Richard Fox, the eldest but illegitimate son of Lord and Lady
Princess Dorothea of Courland Congress of Vienna, and it is even alleged that she became his mistress sometime after 1815. On 31 August 1817, Talleyrand was made a duke and peer of France by Louis XVIII of France, and on 2 December he was also granted the duchy of Dino (a 1.5 km by 1.2 km Calabrian island) by the king of Sicily in recognition of his services at Vienna. The duchy of Dino was immediately handed down to his nephew and his wife and so Dorothea also became duchess of Dino. On 24 March 1818 she and her husband separated, though this was