Eldest son of James Dalrymple (1619-1695) of Stair (a distinguished lawyer in his day, who rose to be President of the Court of Session; wrote a well-known work, "Institutes of the Law of Scotland"; as a Protestant supported the Prince of Orange, and by him was raised to the peerage as viscount in 1690); adopted law as a profession, and was called to the bar in 1672; got into trouble with Claverhouse, and was fined and imprisoned, but in 1687 was received into royal favour, became Lord Advocate, a Lord Ordinary in the Court of Session, and subsequently as Secretary of State for Scotland was mainly responsible for the massacre of Glencoe (q. v .); was created an earl in 1703, and later was active in support of the union of the English and Scottish Parliaments (1648-1707).