The daughter of John Erskine, earl of Mar; she married William Keith, fifth Earl Marischal (c.1585-1635).

REFERENCES TO Mary Keith, countess Marischal [née Erskine]:

Walter Scott to John Wilson Croker, 5 February 1818 in Memoirs of the Life of Sir Walter Scott, Bart. 7 vols (Edinburgh: Robert Cadell, 1837)