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.
Lord Augustus FitzRoy Lord Augustus FitzRoy (16 October 171624 May 1741) was a British officer of the Royal Navy. He served during the War of the Austrian Succession, and was involved in the capture of the Spanish ship of the line, "Princesa", a major prize in the war. He was also the father of Augustus Henry Fitzroy, 3rd Duke of Grafton, who became Prime Minister of Great Britain.