500 



INDEX. 



Nuadat, or Nuada Neacht, who, 213; wife of, 

 ib. 



Nuraggis, of Sardinia, derivation of name, 72 ; 

 description of, ib. 



Nuraghe, of Borghidu, in Sardinia, descrip- 

 tion of, 76, 77, 78 ; illustrations of, 77, 78. 



Nuraghe, the Nieddu, near Ploaghe, descrip- 

 tion of, 78. 



Nuraghes, of Sardinia, description of, byMr.L. 

 C. F. Petit- Radel, 75, 76 ; Author's observa- 

 tions on, and opinions concerning the Nu- 

 raghes of Sardinia, 78, 79- 



O. 



Oak, churches, &c., built with. See Wood. 

 O'Aedhacain, Imar, church built by, 153, 154. 

 Oboli, 228. 

 O'Brien, Dr., quoted, for meaning of cuilceach, 



21 ; misquoted for same by Vallancey, ib. 

 O'Brien, the author of " The Eound Towers of 



Ireland," 79, 80. 



Diarmaid, 283, 284. 



Enda, the son of Diarmaid, 283, 284. 



Muircheartach, 283. 



Tadhg, 243. 



Toirdhelbhach, Cormac Mac Carthy 



killed by, 305, 308. 



Turlough, 287, 288, 440. 



. Dr., his Irish Dictionary misquoted by 



Vallancey, 18. 



his Dictionary referred to, 28, 289, 



305,306, 341. 



O'Brolchain, Flahertach, abbot of Derry, 446. 



Maoliosa, oratory of, burned, 426. 



Observations, celestial, Lanigan's opinion as to 

 the use of the upper portion of the Round 

 Tower for, 34; refutation of this opinion, 35. 



Observatories, astronomical, theory of the use of 

 the Round Towers as gnomons, or astro- 

 nomical observatories, 17, 34,49,50,53-66, 

 69, 70, 72. 



O'Caollaidhe, bishop, church of Knocknasen- 

 gan, at Louth, built by, 59- 



O'Carrol, Donnchadh, king of Airgiall, enu- 

 meration of various acts performed by, 391 ; 

 cloictheachs and neimheds made by, ib. 



church of Knocknasengan at Louth, 



built by, 59- 



O'Catharnaigh, of Kilcoursey, now Fox, from 

 whom descended, 326. 



O'Ceallaigh, Giolla na naomh, abbot of Rathain, 

 243. 



O'Cencucain,Gille Mochohnoc, inscription bear- 

 ing his name, 283. 



O'Cerbhaill, Donnchath, chief king of Airgiall, 

 305. 



Ochain, burial-place of Niall of the Nine Hos- 

 tages, 99, 101 ; derivation of name, ib. 



Ochter n-Achid, purchase of, 218. 



Ochtmama, 178 &e Oughtmama. 



O'Chiarmeic, Mathghamain, inscription bearing 

 his name, 283. 



a Leinster chief, 283, 284. 



family name of, anglicised into Kir- 



by, 284. 



O'Clery, Glossary of, quoted, 59, 341, 434. 



O'Cnaill, the bishop, 143; year of his death, 

 144. 



O'Connell, Peter, referred to, 28, 341. 



O'Conor, Dr. Charles, Vallancey's theory that 

 the Towers were made for celestial observa- 

 tions, adopted by him, and other learned 

 men, 17- 



his Rerum Hibernicarum Scriptores, 



referred to, or quoted, 44, 51, 224, 229, 305, 

 331, 361. 



his observations on the uses of the 



Round Towers, originally, as astronomical 

 gnomons and fire-temples, and subsequently 

 as anchorite retreats, given in his own words, 

 49, 50; examination of the authorities quoted 

 by him in support of his hypothesis, and 

 Author's refutation of inferences, 50-57; 



