He was counsel in a number of high-profile cases, including the Thellusson Will Case, in which he and Samuel Romilly represented the plaintiffs.
Or it may have been named in honor of Sir James Mansfield (1733-1821), Solicitor General of Canada in 1780, or William Murray, 1st Earl of Mansfield (1705–1793).
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He was the grandson of Sir James Mansfield, Solicitor-General and Chief Justice of the Common Pleas.