O'Rorkes the, of Breffny, [53], [205], [527], [545]
O'Rorke, Brian, poem to, [520]
O'Ryans, the, [610]
O'Seasnan, poet, [446]
O'Shaughnessies, the, [33]
O'Sheas, the, [65]
Osgar an fléau [na suiste], [27]
Ossian, or Oisín, Finn Mac Cúmhail's son, [364]; his daughter married to Cormac Cas, ancestor of the Dalcassians, [76], Macpherson's Ossian, [364]; oldest poems ascribed to, [381]; meets Patrick, [383]; lives in Tir na n-óg, [498], [601]; dialogue with St. Patrick, [501]; complaint of, in his old age, [508]
Ossianic poetry, [466], [498] ff; its subject matter, [499]; half-acted, [511]; authorship of, [512]; largely post-Danish, [513]; list of poems, [513]; imitation Ossianic poem, [597], [601]; orally preserved, [606], [628]