The sister of William Erskine (1769-1822) and early friend of Walter Scott; in 1796 she married the Scottish MP Archibald Campbell (later Colquhoun).

CORRESPONDENCE OF Mary Ann Colquhoun [née Erskine]:

Mary Anne Erskine to Walter Scott, [October 1796?] in Memoirs of the Life of Sir Walter Scott, Bart. 7 vols (Edinburgh: Robert Cadell, 1837)