Duke of Buccleuch was another title held by James Scott. This title is a Scottish noble title created in 1663 for Francis Scott, 2nd Earl of Buccleuch. The title is derived from the lands of Buccleuch in Selkirkshire, which were granted to the Scott family in the 13th century.
James Scott, 1st Duke of Monmouth Trivia: How Much Do You Really Know?