Eliza Capot, Comtesse de Feuillide (née Hancock; 22 December 1761 – 25 April 1813) was the cousin, and later sister-in-law, of novelist Jane Austen.

[1] This belief was due to rumours circulated at the time by Jenny Strachey, and many points suggested that Eliza was indeed the daughter of Tysoe Hancock.

In 1779 she settled in France and two years later she married a wealthy French Army Captain, Jean-François Capot de Feuillide, who dubiously styled himself "Comte" (none of his parents or siblings were Comte/Comtesse).

C. L. Thomson believed that Eliza de Feuillide was the model from which glamorous, shrewd and calculating Lady Susan had been created.

[11] Thomson argued that the courtship that took place between Henry Austen and Eliza de Feuillide is reflected in the novel by the courtship of Reginald de Courcy and Lady Susan; similarly, the letters written by Lady Susan to Johnson have the very style and tone of Eliza's own letters to Phylly Walter.

[12] It has often been said that flirtatious Eliza, with all her talent on stage, her vivacity and attractiveness, was the model for the character of Mary Crawford in Mansfield Park.