This surname is one of the oldest in Scotland and the clan is said to have descended from the Celtic Earls of Fife. The genealogies of Kings Lulach and MacBeth are headed "Genealogies of the Clan Duff". In an Act of 1384 mention is made of the "Law Clan Duff", whereby they were given certain privileges. The direct line of the Celtic Earls terminated in 1353. The Duffs of Dipple, in Banffshire, were an important branch. Lord Braco was created Viscount MacDuff and Earl of Fife in 1827. Alexander, Earl of Fife, was created Duke of Fife on his marriage, in 1889, to H.R.H. Princess Louise, daughter of King Edward VII.