Ben Macdui is the second highest
mountain in the
United Kingdom after
Ben Nevis, and the highest in the
Cairngorms. After the defeat of Domnall mac Uilliam in 1187,
Donnchad II, Earl of Fife, acquired Strathavon, territory stretching from
Ballindalloch to Ben Macdui; because the mountain marked the western boundary of Donnchad's territory, historian and place-name scholar Professor
G. W. S. Barrow suggested that the mountain took its name from Donnchad's family, the Mac Duibh.