Ua Ruairc of Bréifne
Kingdom of Bréifne
Tighearnán mór was succeeded by his son Aedh buidhe who quickly died the year following. It was in 1419 that Aedh buidhe's brother Tadhg was elected in his place by the O'Rourkes from "Slieve-an-ierin West". However, Art, son of Tadgh na gCaor, son of Ualgharg mór, was elected in opposition to Tadhg from [the men of] "Slieve-an-ierin East", i.e. by the O'Reillys, the people of Teallach Donnchadha, and the descendants of Melaghlin Mac Rannall. This made sense since the sons of Tadgh na gCaor had their base of power in the southern portion of modern Count Leitrim (in Carrigallen), while the son of Tighearnán mór had their base in the north (in Drumahaire). At this point a great rift had been created and the kingship of "Breffny O'Rourke" became divided between East and West, the dividing point often described as Sliabh An Iarainn (the Iron Mountains, in the middle of co. Leitrim). In effect, "East Breifne O'Rourke" included the area about southern County Leitrim, while "West Breifne O'Rourke" included the northern County Leitrim area. Two of the baronies of modern county Cavan, i.e. Tullyhunco and Tullyhaw, were still considered among the areas included under the watch of the Breifne O'Rourke's at this time. Refer to this map highlighting the baronies most associated with Breifne O'Rourke.
O'Ruairc Castles