O'Grady, Standish Hayes, [Standaois Aodh O'Grádaigh] on Ossianic poetry, [499], [506]; on the Midnight Court, [602]; his "Silva Gadelica" quoted passim.
Ogam writing, [105], [107-108] ff.; [133], [458], [487]
Ogma, the god, [113-15], [285]
O'Gormans, the, [31]
O'Hanlons, of Orior, the, [33]
O'Harts, the, [35]
O'Halloran, the historian, [525]; his history of Ireland, [211], [364]
O'Hartigan, Dunlang, [440]