John George Vanderbilt Henry Spencer-Churchill, 11th Duke of Marlborough, DL, JP, is the son of Lt. -Col. John Spencer-Churchill, 10th Duke of Marlborough and his wife, Hon. Alexandra Mary Hilda Cadogan. His principal seat is Blenheim Palace, in Woodstock, Oxfordshire. He is also a relation of The Duke of Devonshire and generational cousin of the war-time Conservative Prime Minister, Sir Winston Churchill. He is also a distant relative of Diana, Princess of Wales as both belong to the Spencer family; and of the Vanderbilt family through his paternal grandmother, Consuelo Vanderbilt. The Duke of Marlborough ranked 224th in the Sunday Times Rich List 2004, with an estimated wealth of £185m. He allowed Kenneth Branagh to film his production of Hamlet at the ducal palace of Blenheim, and appeared in a small cameo in the motion picture.