Ó Rathaille was born in Screathan an Mhil (Scrahanaveal), in the Sliabh Luachra region of County Kerry into a relatively prosperous family. His father died when Aodhagán was still young leaving his mother in good circumstances. However, his mother relinquished their property and they then moved to Cnoc an Chorrfhiaidh (Stagmount) where Aodhagán lived for a considerable time under the chiefdom of the MacCarthys. It was likely here that Aodhagán was trained in the bardic arts. He acquired an excellent education in the bardic school of the Egan family (ollamhs to the MacCarthy Mórs) and was taught Latin and English as well as Irish literature and history. He became a respected ollamh and traveled to the homes of the Old Irish chiefs where he was treated as an honoured guest.
Aodhagán Ó Rathaille was related to the brehons to the MacCarthy Mór family and would have seen them as his chiefs and patrons. Due to the Munster plantation however, the Browne family (later known as Kenmare) had succeeded to the MacCarthy lands under English occupation. Unlike most of the English settlers, the Brownes soon reverted to their old Catholic faith and made matches with the leading Catholic families in Munster and Leinster - O Sullivan Mór, Fitzgerald of Desmond, MacCarthys, Butlers, O'Briens, Plunketts and many others. Sir Valentine Browne, 3rd Baronet (1638–1694) was a supporter of James II, King of England and was given the title Viscount Kenmare by James. He was the landlord and patron of Aodhagán Ó Rathaille. However, after the fall of James in 1691, Valentine Browne became attainted for his association with James and his estates were made forfeit in 1691. His son Nicholas Browne, 4th Baronet, 2nd Viscount was also a Jacobite supporter and therefore also attainted and could not claim the estates. His children were still to inherit though, so the commissioners of the estate were instructed not to let the estate for more than 21 years. However, it was let to John Blennerhasset and George Rogers (two members of parliament) for a contract of 61 years. Attempting to retain the estate and curry favour, Blennerhasset and Rogers claimed they planned to plant the estate with Protestants when their illegal contract was questioned by the English Commission in 1699. However, the contract was quashed and in 1703 the estate was sold to John Asgill who had married a daughter of Nicholas Browne. Under his management, two ruthless and greed driven men, Timothy Cronin and Murtagh Griffin extorted hearth money from tenants and felled the woods for quick profit (Aodhagán composed a vitriol ridden satire upon the death of Griffin and another in “honour” of Cronin). As a consequence of the loss of the estate by the Brownes, Ó Rathaille had to leave his native district and lived in poor circumstances at Tonn Tóime, at the edge of Castlemaine Harbour, some twelve miles west of Killarney. It wasn’t until the death of Nicholas Browne in 1720, that the estates were again placed under the ownership of a Browne – Nicholas’ son Valentine. Valentine Browne (5th Baronent, 3rd Viscount) took possession of the Kenmare estate upon the death of Nicholas Browne in 1720. Having been destitute for so long, (even composing a poem on his gratitude at receiving the gift of a pair of shoes) Ó Rathaille clearly hoped for a restoration of his position as ollamh and celebrated Valentine’s marriage to Honora Butler in 1720 in an Epithalamium.
However, society had changed vastly in the intervening time and the estates had suffered under the mismanagement of John Asgill and were taking a severely reduced income. Valentine Browne either could not or would not restore Ó Rathaille's position. It is likely the refusal of this request was sufficiently devastating for Ó Rathaille to compose the bitter and mournful poem in which he launches a vitriolic attack on the new English gentry like Valentine Browne and makes reference to the failure of the Jacobites as being a primary cause for his own situation.
The final poem composed by Ó Rathaille on his deathbed is one of the finest of Irish literature and the ultimate expression of the rage and loss that Ó Rathaille had been presenting in poetry during most of his life. William Butler Yeats later made reference to this work in his poem The Curse of Cromwell. Ó Rathaille's life can be seen as a microcosm of the changes in culture and society which occurred in Ireland during the end of the 17th century. His loss of status and resultant destitution are direct parallels of the death of the bardic tradition and the subsequent near extinction of the Irish language. Ó Rathaille is buried in Muckross Abbey near Killarney in County Kerry.
There is a traditional slow air called O'Rathaille's Grave which has been performed by Matt Malloy on the album "Stony Steps". It has also been recorded by Denis Murphy and Julia Clifford on the album "The Star Above the Garter" and by Joe Burke on the album "The Tailors Choice".
S J Connolly, 'The Oxford Companion to Irish History', Oxford University Press
Thomas Kinsella and Sean O Tuama, 'Duanaire, 1600-1900: Poems of the Dispossessed'