From: Early Irish History and Antiquities and the History of West Cork
By Rev. W. O’Halloran
1916

The O’Mahonys of West Cork

Dr. Smith says: ” These Mahowns derive their pedigree from Kean Mac Moyle More, who married Sarah, daughter to Brian Boru, by whom he had Mahown, the ancestor of all the sept. It is from this Kean the village of Iniskeen, in Carbery, has its name, and from this sept that Bandon is sometimes called Droghid Mahon. Mahon was the ancestor of the Mahonys, or O’Mahonys.”
The O’Mahonys, whose stronghold was in the neighbourhood of Bandon (Drohid Mahon), were the first to encroach on the territory of the O’Driscolls. This occurred long before the Anglo-Norman invasion. They possessed themselves of the western portion of Corca Laidhe called Ivahah, which comprised the parishes of Kilmoe, Schull, Durrus, Kilchrohane, Kilmacougue, and Caheragh. They had fourteen strongly built castles.
The Rosbrin…