The sitter was the daughter of the Rt. Hon. George Grenville, sister of the Marquess of Buckingham and Aunt of the 1st Duke of Buckingham. She married Charles Watkin Williams-Wynn, politician and second son of Sir Watkin Williams-Wynn, 4th Baronet of Wynnstey, Denbighshire, on 21 December 1771 as his second wife. She died at Richmond, Surrey on 29 September 1832.