— Tirlogh, Bishop of Killaloe in 1522, [140]

O’Brien’s Bridge, [201]-[203]

O’Briens, the, of Thomond or Clare, [70], [77], [115], [141], [151], [172], [181], [182], [239], [257], [258], [265], [300], [346]

O’Byrne, Owen MacHugh, captain of Kerne, [328]

O’Byrnes, the, of Wicklow, [57], [80], [90], [158], [160], [167], [200], [221], [244], [266], [375], [397]

O’Cahan or O’Kane, in Londonderry County, [62], [239], [272], [349], [376]

O’Caharney;

see [O’Kearney.]

O’Callaghan, of Duhallow in Cork, [242], [268]

O’Carroll, Donough, Prince of Oriel in 1142, [314]