The daughter of George Byng, fourth Viscount Torrington; in 1794 she married Thomas Thynne, second Marquess of Bath.

REFERENCES TO Lady Isabella Elizabeth Thynne [née Byng]:

Sydney Smith to John Archibald Murray, 14 December 1829 in A Memoir of the Reverend Sydney Smith. By his Daughter, Lady Holland. With a Selection from his Letters, edited by Mrs. Austin 2 vols (London: Longman, Brown, Green, and Longmans, 1855)