sentences:  He is said to have discharged his duty in those negotiations "with integrity and honour".He acquired the feudal barony of Newliston, and founded a branch of the Dundas family there, the Dundases of Newliston.Duncan's arms were the arms of his father (Argent, a Lion rampant Gules armed and langued Azure), with the addition of a crescent in the dexter-chief corner, as the mark of a second son.