 Muirchertach O' Brien, son of Toirrdelbach O' Brien and Derbforgaill Of Ossory.Born 1030 at Munster, Ireland, died 1119 at Lismore, Waterford, Ireland, 88 or 89 years Married/ Related to:  Dubhchobhleigh Of Ossory, daughter of Diarmuid Masteige and N.N..Born 1050 at Ossory, Ireland, died 1098, 47 or 48 years Child: 1. Lafracoth O' BrienBorn 1076 at ,, Pembrokeshire, Wales, died 1135 at ,, Pembrokeshire, Wales, 58 or 59 years | |||