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| O'Brien Surname Individuals | 67 Individuals |
| Individual | Birth Date | Death Date | Sex |
 O'Brien, | 1055 | | M |
 O'Brien, Conan | | | M |
 O'Brien, Darbforgaill | 1008 | 1080 | F |
 O'Brien, Dearbforgail | | 1080 | F |
 O'brien, Dearbforgail Ingen Donnchada | | 1080 | F |
 O'Brien, Dearbforgail ingen Donnchada | | 1080 | F |
 O'brien, Dearforgail Ingen Donnchada | | | F |
 O'Brien, Dermont | | 1120 | M |
 O'Brien, Diarmat MacToirrdelbaig King of Ireland | | 1119 | M |
 O'Brien, Donnachad | | 1064 | M |
 O'Brien, Donnchad | | 1064 | M |
 O'Brien, Donnchad | Before 1014 | 1064 | M |
 O'brien, Donnchad (King Of Munster) | | 1064 | M |
 O'Brien, Donnchad of Munster | | 1064 | M |
 O'Brien, Donnell Mor | 1137 | 1194 | M |
 O'Brien, Donnell Mor King Of Thomond | 1137 | 1194 | M |
 O'Brien, Donnell Mor King Of Thomond | 1137 | 1194 | M |
 O'Brien, Donough of Leister | About 0980 | | M |
 O'Brien, Lafeacott | About 1090 | Deceased | F |
 O'brien, Lafracoth | | | F |
 O'Brien, Lafracoth | About 1078 | | F |
 O'brien, Lafracoth | | | F |
 O'Brien, Lafracoth | 1080 | | F |
 O'Brien, Lafracoth | 1076 | | F |
 O'Brien, Lafracoth | 1076 | | F |
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