The Montagu line , c. 1767. When
John Montagu, 2nd Duke of Montagu, died on 5 July 1749, his estate had been entailed to his daughter
Mary, who was married to
George Brudenell, 4th Earl of Cardigan. The Montagu peerages, like most English peerages, were limited to male heirs, and became extinct with Montagu's death. However, within ten days, Cardigan adopted the Montagu name and
coat of arms for both himself and his two children, in order that the Montagu name should continue. Seventeen years later, in 1766,
King George III created him
Duke of Montagu and Marquess of Monthermer. The first duke of the 1766 creation died on 23 May 1790—also survived only by a daughter, Elizabeth, by then Duchess of Buccleuch—and the Montagu peerages once again became extinct when Elizabeth inherited only the unentailed Montagu assets, which included
Boughton House in
Weekley,
Northamptonshire. Like his father-in-law, Buccleuch wished to perpetuate the Montagu name, and adopted the unhyphenated surname
Montagu Scott.
The Douglas line William Douglas, 4th Duke of Queensberry never married; when he died on 23 December 1810, his peerages and entailments passed to his 2nd cousin once removed, Sir Henry Montagu Scott, 3rd Duke of Buccleuch, through Sir Henry's grandmother,
Lady Jane Douglas, Queensberry's first cousin once removed. Buccleuch then added the surname to his own, forming the unhyphenated surname
Montagu Douglas Scott which the family bears to this day. ==Career==