Caroline Spencer, Duchess of Marlborough , formerly Lady Caroline Russell was the daughter of John Russell, 4th Duke of Bedford, and his second wife, the former Gertrude Leveson-Gower.
Her paternal grandparents were Wriothesley Russell, 2nd Duke of Bedford and the former Elizabeth Howland (the daughter and heiress of John Howland of Streatham. Her maternal grandparents were John Leveson-Gower, 1st Earl Gower and the former Lady Evelyn Pierrepont (a daughter of Evelyn Pierrepont, 1st Duke of Kingston-upon-Thames
Image: printed by A. Salmon, published by Henry Graves & Co, after George Romney - mezzotint, published 1908
NPG D38255 ©National Portrait Gallery