That is the lands belonging to the Castle of Dun-Baei, or Dunboy, then belonging to the O'Sullivans Beare of the race of Eibhear, but originally a part of Corca Laidhe, the territory of the O'Driscolls. The Irish called Dursey Island, Oilean Baei Bheirre. See O'Sullivan Beare's Historiae Catholicae Iberniae compendium lib. viii. c. 3. and Pacata Hibernia, vol. ii. p. 563, and Annals of the Four Masters, A.D. 1602.