Princess Sophia 1773

British royalty, a great-granddaughter of King George II of Great Britain and niece of King George III. Her father was Prince William Henry, Duke of Gloucester and Edinburgh, the third eldest son of The Prince Frederick, Prince of Wales. Her mother was the Duchess of Gloucester, the illegitimate daughter of Edward Walpole. As a great granddaughter in the male line of George II, Sophia was styled Her Highness Princess Sophia of Gloucester from birth. On 22 July 1816 Sophia's brother, Prince William Frederick, Duke of Gloucester, married their cousin, The Princess Mary, a daughter of George III. On their wedding day, the Prince Regent bestowed the style of His Royal Highness on the Duke of Gloucester. The next day, Sophia was also bestowed with the style Her Royal Highness, to give her equal rank with her brother. From then on, she was styled Her Royal Highness Princess Sophia of Gloucester. Sophia was considered as a potential bride for the Duke of Clarence (who later ruled as King William IV), but she expressed no enthusiasm for the match. Sophia never married nor had any children. She lived at New Lodge in Winkfield, near Windsor in Berkshire and died on 29 November 1844. Link to Wikipedia biography