Irish genealogy is the study of individuals and/or families who originated on the island of

Ireland Ireland ( ; ga, Éire ; Ulster Scots dialect, Ulster-Scots: ) is an island in the Atlantic Ocean, North Atlantic Ocean, in Northwestern Europe, north-western Europe. It is separated from Great Britain to its east by the North Channel (Grea ...

Origins

Genealogy Genealogy () is the study of families, family history, and the tracing of their lineages. Genealogists use oral interviews, historical records, genetic analysis, and other records to obtain information about a family and to demonstrate kins ...

was cultivated since at least the start of the early Irish historic era. Upon

inauguration In government and politics, inauguration is the process of swearing a person into office and thus making that person the incumbent. Such an inauguration commonly occurs through a formal ceremony or special event, which may also include an inaugu ...

Bards In Celtic cultures, a bard is a professional story teller, verse-maker, music composer, oral historian and genealogist, employed by a patron (such as a monarch or chieftain) to commemorate one or more of the patron's ancestors and to praise t ...

and poets are believed to have recited the ancestry of an inaugurated king to emphasise his

hereditary Heredity, also called inheritance or biological inheritance, is the passing on of traits from parents to their offspring; either through asexual reproduction or sexual reproduction, the offspring cells or organisms acquire the genetic inform ...

right to rule. With the transition to written culture, oral history was preserved in the monastic settlements.

Dáibhí Ó Cróinín Dáibhí Iarla Ó Cróinín (born 29 August 1954) is an Irish historian and authority on Hiberno-Latin texts, noted for his significant mid-1980s discovery in a manuscript in Padua of the "lost" Irish 84-year Easter table. Ó Cróinín was Prof ...

believed that

Gaelic Gaelic is an adjective that means "pertaining to the Gaels". As a noun it refers to the group of languages spoken by the Gaels, or to any one of the languages individually. Gaelic languages are spoken in Ireland, Scotland, the Isle of Man, and Ca ...

genealogies came to be written down with or soon after the practise of annalistic records, annals been kept by monks to determine the yearly

chronology Chronology (from Latin ''chronologia'', from Ancient Greek , ''chrónos'', "time"; and , '' -logia'') is the science of arranging events in their order of occurrence in time. Consider, for example, the use of a timeline or sequence of events. I ...

feast days The calendar of saints is the traditional Christian method of organizing a liturgical year by associating each day with one or more saints and referring to the day as the feast day or feast of said saint. The word "feast" in this context do ...

(see

Irish annals A number of Irish annals, of which the earliest was the Chronicle of Ireland, were compiled up to and shortly after the end of the 17th century. Annals were originally a means by which monks determined the yearly chronology of feast days. Over t ...

). Its cultivation reached a height during the Late Medieval Era with works such as ''

Leabhar Ua Maine ''Leabhar Ua Maine'' (also ''Leabhar Uí Dubhagáin'', ''The Book of Hy-Many'' and RIA MS D ii 1) is an Irish genealogical compilation, created c. 1392–94. History Previously known as ''Leabhar Uí Dubhagáin'', after Seán Mór Ó Dubhagá ...

'', ''

Senchus fer n-Alban The ''Senchus fer n-Alban'' (''The History of the men of Scotland'') is an Old Irish medieval text believed to have been compiled in the 10th century. It provides genealogies for kings of Dál Riata and a census of the kingdoms which comprised Dá ...

'', ''

Book of Ballymote The ''Book of Ballymote'' (, RIA MS 23 P 12, 275 foll.), was written in 1390 or 1391 in or near the town of Ballymote, now in County Sligo, but then in the tuath of Corann. Production and history This book was compiled towards the end of th ...

'', ''De Shíl Chonairi Móir'', ''

Book of Leinster The Book of Leinster ( mga, Lebor Laignech , LL) is a medieval Irish manuscript compiled c. 1160 and now kept in Trinity College, Dublin, under the shelfmark MS H 2.18 (cat. 1339). It was formerly known as the ''Lebor na Nuachongbála'' "Book ...

'', ''

Leabhar Cloinne Maoil Ruanaidh Leabhar Cloinne Maoil Ruanaidh, or the Book of Mac Dermot, is the title given by Nollaig Ó Muraíle to "a collection of genealogies sometimes referred to as 'The Book of Mac Dermot' ..." which now forms the fourth and most significant part - 'd' - ...

'' and the ''

Ó Cléirigh Book of Genealogies The O'Clery Book of Genealogies, also known as Royal Irish Academy Ms. 23 D 17, was written by Cú Choigcríche Ó Cléirigh, one of the Four Masters, who was transported in the 1650s to Ballyacroy, County Mayo, "under the guidance of Rory O'Donn ...

''. This tradition of scholarship reached its

zenith The zenith (, ) is an imaginary point directly "above" a particular location, on the celestial sphere. "Above" means in the vertical direction (plumb line) opposite to the gravity direction at that location (nadir). The zenith is the "highest" ...

with ''

Leabhar na nGenealach ''Leabhar na nGenealach'' ("Book of Genealogies") is a massive genealogical collection written mainly in the years 1649 to 1650, at the college-house of St. Nicholas' Collegiate Church, Galway, by Dubhaltach MacFhirbhisigh. He continued to add ...

'', composed mainly between 1649–1650 in

Galway Galway ( ; ga, Gaillimh, ) is a City status in Ireland, city in the West Region, Ireland, West of Ireland, in the Provinces of Ireland, province of Connacht, which is the county town of County Galway. It lies on the River Corrib between Lo ...

. Genealogy had at first served a purely serious purpose in determining the legal rights of related individuals to land and goods. Under Fenechas, ownership of land was determined by

Agnatic succession Patrilineality, also known as the male line, the spear side or agnatic kinship, is a common kinship system in which an individual's family membership derives from and is recorded through their father's lineage. It generally involves the inheritanc ...

, female ownership being severely limited. Over time, genealogy was pursued for its own merits by the Gaelic learned classes. From c. 1100, various families such as

Ó Cléirigh O'Cleary ( ga, Ó Cléirigh) is the surname of a learned Gaelic Irish family. It is the oldest recorded surname in Europe — dating back to 916 CE — and is cognate with cleric and clerk. The O'Clearys are a sept of the Uí Fiachrach dynasty, w ...

Mac Fhirbhisigh MacFirbis ( ga, Mac Fhirbhisigh), also known as Forbes, was the surname of a family of Irish hereditary historians based for much of their known history at Lecan, Tireragh (now ''Lackan'', Kilglass parish, County Sligo). They claimed descent fro ...

Ó Duibhgeannáin The Ó Duibhgeannáin () clan were a family of professional historians in medieval and early modern Ireland. They originated in the kingdom of Annaly (formerly called Tethbae) on the east bank of the Shannon (mostly situated in what is now ...

Mac Aodhagáin Mac Aodhagáin (English: ''Egan'' or ''Keegan''), is an Irish Gaelic clan of Brehons who were hereditary lawyers - firstly to the Ó Conchobhair Kings of Connacht, and later to the Burkes of Clanricarde. The earliest surviving Irish law manus ...

and

Mac an Bhaird The Mac an Bháird family ( ga, Clann an Bháird) was one of the learned families of late medieval Ireland. The name has evolved over many centuries, the anglicised forms coming down as ''MacAward'', ''McWard'', ''MacEward'', ''MacEvard'', ''Macan ...

became professional historians. They were often employed by ruling families, the most important of whom included

Ó Conchobhair Ó, ó ( o-acute) is a letter in the Czech, Emilian-Romagnol, Faroese, Hungarian, Icelandic, Kashubian, Polish, Slovak, and Sorbian languages. This letter also appears in the Afrikaans, Catalan, Dutch, Irish, Nynorsk, Bokmål, Occitan, Po ...

, Ó Neill,

Ó Domhnaill The O'Donnell dynasty ( ga, Ó Dónaill or ''Ó Domhnaill,'' ''Ó Doṁnaill'' ''or Ua Domaill;'' meaning "descendant of Dónal") were the dominant Irish clan of the kingdom of Tyrconnell, Ulster, in History of Ireland (1169–1536), medieval ...

, Ó Cellaigh, Mac Murchadha Caomhánach, Mac Carthaigh,

Ó Briain The O'Brien dynasty ( ga, label=Classical Irish, Ua Briain; ga, label=Modern Irish, Ó Briain ; genitive ''Uí Bhriain'' ) is a noble house of Munster, founded in the 10th century by Brian Boru of the Dál gCais (Dalcassians). After becoming ...

, Ó Mael Sechlainn, Mac Giolla Padraig. It also became pervasive among the

Anglo-Irish Anglo-Irish people () denotes an ethnic, social and religious grouping who are mostly the descendants and successors of the English Protestant Ascendancy in Ireland. They mostly belong to the Anglican Church of Ireland, which was the establis ...

, with the recording of the family trees of

FitzGerald The FitzGerald/FitzMaurice Dynasty is a noble and aristocratic dynasty of Cambro-Norman, Anglo-Norman and later Hiberno-Norman origin. They have been peers of Ireland since at least the 13th century, and are described in the Annals of the ...

Butler A butler is a person who works in a house serving and is a domestic worker in a large household. In great houses, the household is sometimes divided into departments with the butler in charge of the dining room, wine cellar, and pantry. Some a ...

Burke Burke is an Anglo-Norman Irish surname, deriving from the ancient Anglo-Norman and Hiberno-Norman noble dynasty, the House of Burgh. In Ireland, the descendants of William de Burgh (–1206) had the surname ''de Burgh'' which was gaelicised ...

Plunkett Plunkett is an Irish surname derived from the Gaelic Ó ''Pluingceid''. It is associated with Ireland, and possibly of Norse or Norman origin; it may be spelled O'Plunket, Plunket, Plunkit, Plunkitt, Plonkit, Plonkitt, Plonket, Plonkett, or Ó P ...

, Nugent, Bermingham and others. Some clans, such as

and

were originally hereditary

ecclesiastical {{Short pages monitor