Which British peer and politician born in 1734 was a great-grandson of the 1st Duke of Marlborough?
Earl Spencer (peerage) Earl Spencer is a title in the Peerage of Great Britain that was created on 1 November 1765, along with the title Viscount Althorp, of Althorp in the County of Northampton, for John Spencer, 1st Viscount Spencer. He was a member of the prominent Spencer family and a great-grandson of the 1st Duke of Marlborough. Previously, he had been created Viscount Spencer, of Althorp in the County of Northampton, and Baron Spencer of Althorp, of Althorp in the County of Northampton, on 3 April 1761.
William Cavendish, 2nd Duke of Devonshire William Cavendish, 2nd Duke of Devonshire {'1': ", '2': ", '3': ", '4': "} (1672 – 4 June 1729) was a British nobleman and politician. He was the eldest son of William Cavendish, 1st Duke of Devonshire and Lady Mary Butler. A prominent Whig, he was sworn of the Privy Council in 1707, and served as Lord President of the Council from 1716 to 1717 and 1725 to 1729. He married The Hon. Rachel Russell (1674–1725), daughter of William Russell, Lord Russell on 21 June 1688.