O
Ocha, importance of the battle of, [190], [231]
Oengus (Aonġus), a Celtic god, [86]
Oengus (Aonġus), king of Munster, [128]
O'Farrell (Ua Fearġail) territory extended, [336]
Ogham alphabet, origin of, [170];
inscriptions, range and time of, [173]Ogmios, Ogme (Oġma), a Celtic god, [171]
Oileach=Ailech
oirchinnea=chairchinnech
oireacht=airecht
Oirghialla=Airgialla
O'Neill, Brian, career of, [328];
chosen chief king, [331]O'Neill dynasty, increased power of, [343]
Oriel=Airgialla
Orosius, Irish writers influenced by, [90], [92]-[95]
Ovoca, curious origin of the name, [139]
P
"P-Celts" and "Q-Celts," [43], [46]
Paganism, survival of, [224]
Palæolithic Age not represented in Ireland, [68]
Palladius, Saint, mission of, [163]
Patrick, Saint, [159];
date of his death, [222];
Bury's account of, [225]Pelagius, [164]
Pentarchy in Irish tradition, [100]
Picts, supposed to be Iberians, [41];
Ireland and Britain named from, [59];
in Ireland and Scotland, [62]-[65];
legendary origin of, [64];
in Ireland, [74];
in Ulster, [120], [185];
earliest mention of, [141];
in Connacht, [180];
their kingdom in Scotland overthrown, [204];
they lose territory in Ulster, [233]Pliny on Ireland, [135]
Political system in ancient Ireland, [274]-[278]
Pomponius Mela on Ireland, [134]
Poseidonios on Ireland, [133]
Pre-Celtic population of Ireland, [73]
Pre-Celtic metal workers, [75], [76]
Pretani, significance of the name, [59], [62]
Primitive races, assumptions regarding, [83]
Ptolemy on Ireland, [136]
Q
Qreteni, an ancient name for the Picts, [59]
R
Race, true and false notions of, [1], [2]
Racial fusion in Ireland, [229]
Red Earl of Ulster, [336]
Revolt against Gaelic rule, [80], [119]
Rígdamna (ríoġḋaṁna), precise meaning of, [231]
Roman empire, collapse of, [158]
Roman military system influences Ireland, [150]
"Rosnaree," Ros na Ríoġ, battle of, [103]
S
Schools, reorganisation of, [284]
Scotland, Irish colonisation of, [194];
Irish settlements extend to east coast, [202];
conquest by Cinaed (Cionaoḋ), [204];
centralised polity of, [206];
extent of Irish colonisation, [207];
anglicisation, [208];
feudal institutions introduced, [209]Scotti, legendary origin of, [90];
earliest mention of, [143];
meaning of the name, [144];
St. Jerome's account of, [146]Scottish history, earliest documents of, [198]
Scythians in Irish legend, [91]
Segomo, a Celtic god, [127]
Semaine (Seamaine), Semrige (Seimriġe), Semonrige (Seamonraiġe), Tuath Semon (Seaman), [75], [78]
Síol Aedo Sláne (Síol Aoḋa Sláine), dynasty of, [236]
Sliab Badbgnai (Sliaḃ ḃáġna, "Slieve Baune"), [78]
Sliab Echtgi (Sliaḃ Eaċtġa, "Slieve Aughty or Baughty"), [78]
Snakes absent from Ireland, [140]
Solinus on Ireland, [140]
States in ancient Ireland, classification of, [274], [275]
Strabo on Ireland, [134]
Sumarlidi (Soṁairliḋ), founds a kingdom in western Scotland, [214];
spurious pedigree of, [215];
sends embassy to Derry, [284];
his descendants in Ireland, [326], [334]