The mausoleum is a structure of 1817, designed by J P Papworth and set in Knebworth Deer Park. Last resting place of family members, including:

• Lady Constance Lytton, daughter of Robert, 1st Earl of Lytton, who continued the struggle for the emancipation of women engaged in by her grandmother Rosina and her great-grandmother Anna Wheeler. Died in 1923 aged 54, but not before Parliament had passed a bill, in January 1918, giving women over 30 the vote. Inscribed on the mausoleum her family has left the following epitaph: “Endowed with a celestial sense of humour, boundless sympathy, and rare musical talent, she devoted the later years of her life to the political enfranchisement of women and sacrificed her health and talents in helping to bring victory to this cause”.