Frances Jocelyn, Viscountess Jocelyn Cowper was born in 1820, the youngest daughter of Emily Lamb, Countess Cowper, a daughter of Peniston Lamb, 1st Viscount Melbourne. Her paternity was officially attributed to Lady Cowper's husband, the 5th Earl Cowper. However, the historian K.D. Reynolds and others have argued that Henry John Temple, 3rd Viscount Palmerston was actually the father of Lady Frances and her brother William. Once widowed, her mother married Palmerston, though Lady Frances did not care for him. He became Prime Minister in 1859. In 1838, Lady Frances served as a maid of honour at the Coronation of Queen Victoria, and she also
Frederick Lamb, 3rd Viscount Melbourne Baron Beauvale, of Beauvale in the County of Nottingham. In 1848 he succeeded his elder brother as third Viscount Melbourne. Despite a certain personal distance between them, Lord Palmerston, as Foreign Secretary placed great confidence in Lamb, wrote to him in a courteous style very different from his usual brusque manner, and left the running of the Vienna Embassy almost entirely in his hands. The coolness was due to Palmerston's decades-long affair with Lamb's sister Emily, Lady Cowper; Lamb disapproved of the affair and disapproved equally of their eventual marriage, although this proved to be very happy. Palmerston's biographer notes