He was in line to inherit a Dukedom for years until an heir was born. Duke of Marlborough.
Vanderbilt money saved his birth home -Blenheim Palace. Over 700 rooms. The Royals uses it as a filming location.
Oops, that is in error. Buckingham Palace has over 700 rooms. Blenheim about 187. It’s the grounds of Blenheim that are bigger than Buckingham Palace...or at least were..I think they sold some off.