Toirrdelbach O'Brien
Toirrdelbach was born about 1010 in Ireland.  He died on July 14th, 1086.

 Diborgaill Ingen Taidg of Ossory
Diborgaill Ingen Taidg of was born in 1018 in Ossory, Ireland.

 Muircetrach O'Brien
Muircetrach was born about 1055 in Ireland.  He died in 1119 in Lismore, Waterford, Ireland.

 Diarmat MacToirrdelbaig O'Brien
Diarmat MacToirrdelbaig was born about 1060 in Munster, Ireland.