O’Mellan, Friar, [119], [121]

Omodei, Cardinal Luigi, [96]

O’More, Roger or Rory, [18], [26], [170], [298], [299]

O’Neill, Art MacBaron, [20]

— Daniel, [61], [69], [114], [126], [142], [196], [198], [227], [243]

— Henry, [198], [231], [233]

— Hugh Boy, ‘an old surly Spanish soldier,’ defends Clonmel, [220]-[222], [227];

defends Limerick, [247], [265], [272];

tried and acquitted, [274], [275]

— John, titular Earl of Tyrone, [275]