Portrait of Caroline, 4th Duchess of Marlborough, half-length, in a blue and white dress

Thomas Gainsborough, R.A. (Sudbury, Suffolk 1727-1788 London) Portrait of Caroline, 4th Duchess of Marlborough, half-length, in a blue and white dress with inscription 'Caroline Duchess of Marlborough by Gainsborough' on the reverse of the old frame (now overmounted) pastel on green-brown paper 12 5/8 x 9 5/8 in. (32.1 x 24.4 cm.)