Líon alt a bhfuil an ghné seo luaite iontu: 4
Ceapadh ina bhiocáire ar Bhré é agus thosaigh sé ag obair ar History of Ireland from the invasion of Henry II ...,1773 ··· To assist him he translated extracts from the Annals of the Four Masters and from other Irish sources for Leland, but the latter made disappointingly little use of these in his three-volume History of Ireland.’ I 1773 bhí sé ina bhiocáire ar Eaglais San Anna i mBaile Átha Cliath agus dhá bhliain in a dhiaidh sin thug sé suas a chomhaltas i gColáiste na Tríonóide agus ghlac le beathúnas Ard Sratha i gContae Thír Eoghain
Freagra ar History of Ireland le Thomas Leland[q.v.] is ea Ierne Defended, 1774
Shíl Thomas Addis Emmet (1764–1827) gurbh é tionchar an leabhair sin a thug ar Éireannaigh Aontaithe Bhaile Átha Cliatha bheith go hiomlán ar son Fhuascailt na gCaitliceach. Scríobh sé eagrán méadaithe de Historical Memoirs faoin teideal A Historical and Critical Review of the Civil Wars in Ireland, 1775; iarracht ba ea é ar scéalta Thomas Leland[B6] (History of Ireland from the Invasion of Henry II, 1773) faoi mharú na bProtastúnach i 1641 a bhréagnú
Tuairiscíodh in Freeman’s Journal: ‘In his researches on early Irish history Mr O’Clery earned for himself outstanding distinction and the result of his labours as represented in his best-known work The History of Ireland to the coming of Henry 11, 1908, evidenced how wide was his knowledge of his favourite subject and how appealing was the charm of his style’.