Fergus
Fergus, one of the chiefs who headed the migration of the Irish to the Western Highlands of Scotland, about the beginning of the 6th century. He was the second son of Erc, King of Dalriada, and with his brothers Lorn and Angus made a successful settlement on the promontory of Cantire about 503. Fergus took possession of Cantire, Lorn of the district which bears his name; and Angus colonized Islay. Fergus is said to have died in 506, and to have been succeeded by his son Domangart.
Sources
39. Biographical Dictionary, Imperial: Edited by John F. Waller. 3 vols. London, N.D.