John Winston Spencer Churchill, 7th Duke of Marlborough (1822-83), son of the 6th Duke, was a Conservative politician. As Marquess of Blandford he was M.P. for Woodstock, 1844-45 and 1847-57. Churchill was Lord Steward of the Household, 1866-67, and Lord President of the Council in Benjamin Disraeli's government, 1867-68. Disraeli offered him the Viceroyalty of Ireland in 1874, which he declined, but he accepted the post in succession to the Duke of Abercorn in 1876, and was Lord Lieutenant (Viceroy) until Lord Beaconsfield's ministry resigned in 1880. He was the father of Lord Randolph Churchill.