A townland on the other side of Torrcor hill (and townland) has an eponymous ruin, Altagore Cashel. Mores the pity we did not visit this site, a thick drystone enclosing wall from the 5th century (you can see photographs from another site at this link). Cashel is from the Irish Caiseal, a circular, defensive fort (“ring fort”).
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Books such as “Antrim and Argyll: Some Aspects of the Connections” tell of connections over the millennia, clan associations between the islands and ring forts such as Altagore Cashel.