 In the 16th century "Breifne O'Rourke" eventually became County Leitrim and "Breifne O'Reilly" became County Cavan.The following territories were at one stage part of Breifne.Duncarbry ("Dun Chairbre") marks the border of Cairbre's territory on the Drowes, while the Barony of Carbury in North Sligo still reminds us also today.