Dal gCais - Irish Names and Surnames

Rev Patrick Woulfe
1923

DAL gCAIS, race of Cas, the sixth in descent from Cormac Cas, son of Oilioll Olum, King of Munster in the 3rd century; the name of the great clan of Thomond, or North Munster, which embraced several distinguished families and of which the O'Briens were the chiefs.

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