George Spencer-Churchill, 6th Duke of Marlborough DCL (27 December 1793 1 July 1857), styled Earl of Sunderland until 1817 and Marquess of Blandford between 1817 and 1840, was a British peer. The great-grandfather of Sir Winston Churchill, he served as Lord-Lieutenant of Oxfordshire between 1842 and 1857.Styled Earl of Sunderland from birth, Marlborough was born at Bill Hill, Wokingham, Berkshire (an estate his father was renting at the time), the eldest son of George Spencer-Churchill, 5th Duk ...