William Murray, 1st Earl of Mansfield (1705-1793), third son of David, 5th Viscount Stormont; called to the Bar in 1730; 1742 Solicitor-General; 1754 Attorney-General; 1756 Lord Chief Justice of England; elevated to the peerage of Baron Mansfield in the co. of Nottingham in the same year; married Elizabeth, daughter of Daniel, Earl of Winchelsea and Nottingham

Another version of this miniature is housed in the University Galleries, Oxford, signed and dated by Birch, 1793 (G. C. Williamson The History of Portrait Miniatures 1531-1860, London, 1904, II, p. 65, pl. LXXXII, fig. 4)