Colin Campbell, 3rd of Ardkinglass

Not a son of Colin Campbell, 1st Earl of Argyll & Isabel Stewart of Lorn his wife. See:

http://archive.org/stream/scotspeeragefoun01pauluoft#page/356/mode/2up

CAMPBELL, DUKE OF ARGYLL 335

By Isabel Stewart, his wife, already described, who died at Dumbarton 26 October 1510, and was buried at Kilmun, he [Colin Campbell, 1st Earl of Argyll] had issue :

Source= http://our-royal-titled-noble-and-commoner-ancestors.com/p4796.htm#...

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In 1432, Colin, second son of Duncan Campbell (later 1st Lord Campbell), was granted Glenorchy, at the north end of Loch Awe. This grant was designed to ensure Colin’s loyalty following the sudden death of his elder brother, Gillespic.

Colin’s descendants, the Campbells of Glenorchy (later earls of Breadalbane), were the most powerful of the numerous cadets of Clan Campbell. Indeed, there were times when this branch almost rivalled the clan chiefs, the earls of Argyll, for supremacy.

Kilchurn remained their powerbase for 150 years. It was not abandoned until the 1700s.

The charter of 1449 Sir Colin Campbell built the castle on ‘Elankylquhurne’ (island of Kilchurn) before his death in 1475. A charter dated March 1449 ‘apud Castrum de Glenurquhay’ (at the Castle of Glenurquhay) confirms its existence by that date.

The castle comprised a five-story tower-house at one corner of an irregular-shaped courtyard. The tower house still stands substantially complete, overshadowing the rest of the complex. On the ground level of the tower were a cellar and prison. There was a hall on the first floor and private chambers above.

https://www.visitscotland.com/info/see-do/kilchurn-castle-p859451