Surtees, A Catalogue Raisonné, vol. 1, 198 (no. 521).
DGR made this portrait when he was staying at Broadlands in August 1876. He wrote to his mother on 24 August that
the “beautiful and excellent Mrs. Sumner (wife of the Royal Master of Hounds) is here. . .and a great boon for cheerfulness, intelligence, and no less for willingness to sit. She is one of the most beautiful women I ever saw, though now past her youngest, and of the noblest antique Roman type—a perfect Agrippina or Cornelia. I hope to be able to paint something good from her” (see
Fredeman, Correspondence, 76. 122 and 126