[2] During the reign of Alexander II, Umphredus de Kilpatrick received from Malduin, Earl of Lennox, the estates of Colquhoun, Auchentorily and Dumbuck.

[2] The clan chief's early stronghold was at Dunglass Castle, which is perched on a rocky promontory by the River Clyde.

[2] Dunglass was also close to the royal Dumbarton Castle, of which later Colquhoun chiefs were appointed governors and keepers.

[2] During the minority of James II of Scotland, Sir John Colquhoun was appointed governor of the royal Dumbarton Castle.

[2] Sir John fought at the siege of Dunbar Castle which was being held by rebels and there he was killed by a cannonball.

[2] The sixth Colquhoun Laird of Camstradden was a renowned knight and in 1547 fought at the Battle of Pinkie Cleugh.

[2] At the end of the 18th century, the chiefs of the two clans met and shook hands on the very site of the former slaughter.

[2] However, in 1632 he was accused of absconding with his wife's sister, Lady Catherine Graham, daughter of the Earl of Montrose.

[2] He died without male issue and the title passed to his daughter's husband, James Grant of Pluscardine.