Consuelo Vanderbilt. Consuelo Balsan (formerly, Consuelo, Duchess of Marlborough; born Consuelo Vanderbilt) (2 March 1877 6 December 1964), was a member of the prominent American Vanderbilt family. Her marriage to the Charles Spencer-Churchill, 9th Duke of Marlborough became an international emblem of the socially advantageous but loveless marriages common during the Gilded Age.
