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, 1st Duke of Devonshire William Cavendish, 1st Duke of Devonshire (25 January 1640 – 18 August 1707) was an English soldier, nobleman, and Whig politician who sat in the House of Commons from 1661 to 1684 when he inherited his father's peerage as Earl of Devonshire. He was part of the "Immortal Seven" group that invited William III, Prince of Orange to depose James II of England as monarch during the Glorious Revolution, and was rewarded with the elevation to Duke of Devonshire in 1694.