Seathrún Céitinn (c. 1569 – c. 1644; known in English as Geoffrey Keating) was a 17th-century historian. He was born in County Tipperary, Ireland, and is buried in Tubrid Graveyard in the parish of Ballylooby-Duhill, and became a Irish Catholic priest and a poet.
It was generally believed until recently that Keating had been born in Burgess, County Tipperary; indeed, a monument to Keating was raised beside the bridge at Burgess, in 1990; but Diarmuid Ó Murchadha writes,
The presumption that [Keating] attended a bardic school at Burgess, Co. Tipperary, is attributable to Thomas O'Sullevane, a shadowy character from the fringes of literary circles in London. The same unreliable source names Burgess as Keating's place of birth, whereas recent work (Cunningham 2002) indicates that Moorstown Castle in the parish of Inishlounaght [in Tipperary] was his probable birthplace." 
In November 1603, he was one of forty students who sailed for Bordeaux under the charge of the Rev Diarmaid MacCarthy to begin their studies at the Irish College which had just been founded in that city by Cardinal François de Sourdis, Archbishop of Bordeaux. On his arrival in France he wrote Farewell to Ireland, and upon hearing of the Flight of the Earls wrote Lament on the Sad State of Ireland. After obtaining the degree of Doctor of Divinity at the University of Bordeaux he returned about 1610 to Ireland and was appointed to the cure of souls at Uachtar Achaidh in the parish of Knockgraffan, near Cahir, where he put a stop to the then-common practice of delaying Mass until the neighbouring gentry arrived.
The Foras Feasa traced the history of Ireland from the creation of the world to the invasion of the Normans in the 12th century, based on the rich native historical and pseudohistorical traditions (including that of the Milesians), historical poetry, annals and ecclesiastical records. The Foras Feasa circulated in manuscript, as Ireland's English administration would not give authority to have it printed because of its pro-Catholic arguments. It was a time of religious repression; in 1634 a political campaign for a general reform of anti-Catholic laws, known as the Graces, was denied by the viceroy.
Having Old English ancestry, Keating held the political view that Ireland's nobility and natural leadership derived from the surviving Gaelic clan chiefs and Old English landed families who had remained Catholic. He accepted the Stuart dynasty as legitimate. This had a continuing influence on the politics of the Confederate and Jacobite supporters in Ireland until Papal recognition of the Stuarts ended in 1766. Keating continued to influence Irish genealogical writers such as John O'Hart into the 1800s.
One edition of Foras Feasa was printed by subscription in Dublin by J Christie, 16 Ross-Lane, in 1809. In it, Keating's first name was spelt Jeoffry. Volume 1 contains 486 pages, Volume 2, 467 with four pages of notes and 12 pages of subscribers.
- Bernadette Cunningham The World of Geoffrey Keating: history, myth and religion in seventeenth century Ireland (Dublin 2000).
- Geoffrey Keating Foras Feasa ar Éirinn: the history of Ireland D. Comyn and PS Dineen (eds.) 4 vols. Irish Texts Society (London 1902-14). (Available for download: https://archive.org/details/forasfeasaarir06keatuoft)
- Geoffrey Keating Trí bior-ghaoithe an bháis: The three shafts of death ed. Robert Atkinson, LL.D. Royal Irish Academy (Dublin: 1890);
- Geoffrey Keating Stories from Keating's History of Ireland edited, with introduction, notes, and vocabulary by Osborn Bergin. Royal Irish Academy (Dublin: 1981)
- Geoffrey Keating Dánta, Amhráin is Caointe (Poems, Songs and Elegies), ed. Rev. John C. MacErlean, S.J. The Gaelic League (Dublin: 1900)
- Geoffrey Keating Eochairsciath an Aifrinn: An explanatory defence of the mass, ed. Patrick O'Brien (Dublin: 1898)
- Geoffrey Keating "History of Ireland: Foras Feasa ar Eirinn" trans. O'Mahoney. 3 vols. Irish Genealogical Foundation (1980)
- Diarmuid Ó Murchadha (2005) "A review of some placename material from Foras Feasa ar Éirinn", Éigse, A Journal of Irish Studies, Vol. 35, p. 81, National University of Ireland
- Herbermann, Charles, ed. (1913). "Geoffrey Keating". Catholic Encyclopedia. New York: Robert Appleton Company.
- The History of Ireland (translation) of Foras Feasa ar Éirinn at University College Cork's CELT- Corpus of Electronic Texts
- The History of Ireland (English Translation) with memoir, notes and genealogies at The Ex-Classics Web Site.