The castle may have been one of the earliest stone fortifications in the county of Argyll and prior to becoming a royal castle may have been occupied by the MacDougalls.
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It was this position that made him the enemy of Iain of Lorn, the MacDougall Lord of Lorne.
Coeffin Castle was built in the 13th century, probably by the MacDougalls of Lorn.
Although their descent from Godred Crovan is through the female line, Alex Woolf believes the Clann Somhairle (Clan Donald and Clan MacDougall) or the Lords of the Isles can be regarded as a "cadet branch" of the Uí Ímair, as they apparently based their claim to the Isles on this descent (according to Woolf).