John Churchill (c. 1685–1690) by John Closterman Seven men met to draft the invitation to the Protestant Dutch Stadtholder , William, Prince of Orange, to invade England and assume the throne. The signatories to the letter included Whigs , Tories , and the Bishop of London , Henry Compton , who assured the Prince that, "Nineteen parts of twenty of the people ... are desirous of change". 
John Winston Spencer-Churchill, 7th Duke of Marlborough KG PC (2 June 1822 – 4 July 1883), styled Earl of Sunderland from 1822 to 1840 and Marquess of Blandford from 1840 to 1857, was a British Conservative cabinet minister, politician, peer, and nobleman.
Portrait of John Spencer-Churchill with his parents and younger brother, by John Singer Sargent, 1905. He was born in London on 18 September 1897 as the first of two sons born to Charles Spencer-Churchill, 9th Duke of Marlborough and his first wife, the former Consuelo Vanderbilt , an American railroad heiress. 
John George Vanderbilt Henry Spencer-Churchill, 11th Duke of Marlborough, JP, DL (13 April 1926 – 16 October 2014) was a British peer. He was the elder son of the 10th Duke of Marlborough and his wife, the Hon. Alexandra Mary Hilda Cadogan.
Charles Richard John Spencer-Churchill, 9th Duke of Marlborough, KG, TD, PC (13 November 1871 – 30 June 1934), styled Earl of Sunderland until 1883 and Marquess of Blandford between 1883 and 1892, was a British soldier and Conservative politician, and a close friend of his first cousin Winston Churchill.
Comenzó a trabajar en Marlborough: His Life and Times, una biografía en cuatro volúmenes de su antepasado John Churchill, primer duque de Marlborough.   Fue en ese momento que se había ganado la reputación de ser un gran bebedor de bebidas alcohólicas, aunque Jenkins cree que a menudo era exagerado. 
Marlborough was born in England on 13 May 1844. He was the eldest son of John Spencer-Churchill, 7th Duke of Marlborough (1822–1883), who served as Lord Lieutenant of Ireland and Lord President of the Council, and Lady Frances Anne Emily Vane (1822–1899). He was the elder brother of Lord Randolph Churchill and the uncle of Winston Churchill.