This is the first comprehensive study of the work of Sean O Dalaigh/John O'Daly, the great nineteenth-century scribe; compiler and collector of manuscripts, editor, anthologist; publisher of Gaelic verse and stories and founder of societies for the publication of Gaelic literature. In addition, he is an important figure in the development of Anglo Irish literature. Written in Irish, the book includes a detailed analysis of his sources, manuscript compilations, printed editions and connections in the literary world. I measc na neacht a chuir se i gcrich bhi solathar oidhreacht na lamhscribhinni Gaeilge i bhfoirm chlo ar luach iseal. Bhiodh diol agus foilsiu leabhar ar bun aige in eineacht agus chuir an sraithfhoilseachan, Reliques of Irish Jacobite Poetry (1844) amhrain pholaitiula na Mumhan agus an chruinneshamhail a ghabh leo ar fail do chach. Leirigh a leabhar, Poets and Poetry of Munster (1849), agus na haistriuchain chluiteacha le James Clarence Mangan a foilsiodh ann, buanna eigse iarChlasaiceach na Gaeilge. San Irish Language Miscellany (1876) diolamaiodh an eigse scriofa agus bheil i dteannta a cheile ar chuma a bhi mar eiseamlair san fhichiu haois.
Agus a ghno diolta/foilsithe leabhar bogtha o Chill Chainnigh go Baile Atha Cliath aige, bhunaigh se an Cumann Ceilteach ann i lar na 1840i agus bhunaigh se an Cumann Oisineach in 1853. D'fheach an Cumann Oisineach ach go hairithe le laoithe agus scealta Fiannaiochta a bhi i lamhscribhinni na Mumhan a chur i gclo.