Mary Montagu Douglas Scott, Duchess of Buccleuch

(Vreda Esther) Mary Montagu-Douglas-Scott, Duchess of Buccleuch and Queensberry ( Lascelles; 17 September 1900 – 9 February 1993), was an English aristocrat who was commonly known as Molly Buccleuch.

Early life Mary Montagu was the elder of the two daughters of Maj. William Frank Lascelles and Lady Sybil Evelyn de Vere Beauclerk. Her younger sister, Diana Lascelles, married the aide-de-camp to the Viceroy of India, Maj. Denis Bowes Daly (a son of Maj. Denis St. George Daly).

Her paternal grandparents were diplomat Frank Lascelles (a grandson of the 2nd Earl of Harewood) and Mary Emma Olliffe (a daughter of Sir Joseph Olliffe). Her maternal grandparents were William Beauclerk, 10th Duke of St Albans, and his first wife, Sybil Mary Grey. Through her mother, she was descended from Charles Beauclerk, 1st Duke of St Albans, an illegitimate son of King Charles II of England and his mistress Nell Gwynn.

Lady Elizabeth Diana Montagu Douglas Scott (1922–2012), who married Hugh Percy, 10th Duke of Northumberland, on 12 June 1946. They had seven children and seventeen grandchildren. on 10 January 1953. They hadfour children, ten grandchildren and two great-grandchildren. Caroline Montagu Douglas Scott (1927–2004), who married Ian Gilmour (later created a life peer as Baron Gilmour of Craigmillar), on 10 July 1951. They had five children, including historian David Gilmour, and seventeen grandchildren.

The Duchess died aged 92 at Boughton House on 9 February 1993. She was buried next to her husband among the ruins of Melrose Abbey.