This clan takes its name from the lands of Colquhoun which came into their possession during the reign of King Alexander II. Later, they acquired the lands of Luss on the side of Loch Lomond and thereafter the chief became known as Colquhoun of Luss. After a desperate battle with the MacGregors in 1602 the Colquhouns sought to trap the MacGregors but were defeated and their chief killed. Following this affair the MacGregors were proscribed and their name forbidden under pain of death. Sir John Colquhoun, known as the "Black Cock of the West", was an able and learned politician.