Which British peer and politician born in 1734 was a great-grandson of the 1st Duke of Marlborough?
John Spencer, 1st Earl Spencer John Spencer, 1st Earl Spencer (19 December 1734 – 31 October 1783) was a British peer and politician.
William Cadogan, 1st Earl Cadogan William Cadogan, 1st Earl Cadogan, (c.1671 – 17 July 1726) was a noted military officer in the army of John Churchill, 1st Duke of Marlborough during the War of the Spanish Succession. He commanded the 1st Foot Guards for some time.