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
William Lamb, 2nd Viscount Melbourne as the Whig MP for Leominster. For the election in 1806 he moved to the seat of Haddington Burghs, and for the 1807 election he successfully stood for Portarlington (a seat he held until 1812). Lamb first came to general notice for reasons he would rather have avoided: his wife had a public affair with Lord Byron—she coined the famous characterisation of Byron as "mad, bad and dangerous to know". The resulting scandal was the talk of Britain in 1812. Lady Caroline published a Gothic novel, "Glenarvon", in 1816; this portrayed both the marriage and her affair with Byron in