Mary was the daughter of Thomas Lodge of Leeds and married Sir Richard Joseph Sullivan, 1st Bt (1752-1806) in December 1778 and had eight children. Sir Richard, third son of Benjamin Sullivan of Dromeragh, Co. Cork, a barrister and Clerk of the Crown for Cork and Waterford, was sent early in his life to India with his brother John with the help of Laurence Sulivan (1713-1786), chairman of the East India Company, and a possible uncle. Sir Richard returned to England and was elected MP for New Romney in 1787 and 1790 but lost his seat in 1796 and in 1802 was elected MP for Seaford. In 1804, he was created a baronet. He wrote a number of books on political issues. Their third son Charles (1789-1862) inherited the baronetcy and was Admiral of the Blue.
A watercolour of Sir Richard Sullivan, signed and dated 1785 is illustrated D. Foskett (op. cit.), pl. XV, no. 56 (Collection of Mrs Burton-Jones). A finished miniature by Smart, signed and dated 1779, which may depict the same sitter as in the present portrait, described as ‘A lady’ was exhibited London, Burlington Fine Arts Club, Exhibition of Portrait Miniatures, 1889, Case X, no. 17 (illustrated pl. XXI of the exhibition catalogue), lent by Jeffery Whitehead.