 It was then taken over by Brian Luighnech Ua Conchobhair of the O'Conchobar dynasty sept called the Clann Aindrias or Ó Conchobhair Sligigh in the period of instability following the Norman conquest of Ireland.He was killed in 1181 at Magh-Diughbha in Crich Coirpre with his brother Maghnus by the Cenel Conaill.In 1051 AD Cathal, son of Tighearnain, lord of Breifne, went upon a predatory excursion into Eabha, and demolished Dun-Feich, where fifty persons were slain, and whence seven hundred cows were carried off.