O'Longan, scribe, [xi]

O'Mahony, John, the Fenian, [179], [364], [558]

O'Mahonys, Finn and Roe, the, [62]; of Carbery, ditto.

O'Malone, [206]

O'Mahon, a scribe, [228], [341], [403]

O'Mellon, friar, narrative of, [568]

O'Meaghers, the, [32], [477]

O'Meehans, the, [62]

O'Melaughlins, the, [206]

Omens, Cuchulain's evil, [343], [347]