In 1839, Palmerston married his mistress of many years, the noted Whig hostess Emily Lamb, widow of Peter Leopold Louis Francis Nassau Clavering-Cowper, 5th Earl Cowper (1778–1837) and sister of William Lamb, 2nd Viscount Melbourne, Prime Minister (1834 and 1835–1841). They had no legitimate children, although at least one of Lord Cowper's putative children, Lady Emily Cowper, the wife of Anthony Ashley-Cooper, 7th Earl of Shaftesbury, was widely believed to have been fathered by Palmerston. Palmerston resided at Brocket Hall in Hertfordshire, his wife's inheritance. His London townhouse was Cambridge House on Piccadilly in Mayfair. He also owned Broadlands at Romsey in Hampshire.