Three Tuathas

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The Three Tuathas (Irish : Na Teora Tuatha) was a name of a kingdom consisting of three kingdoms in County Roscommon, Ireland lying between Elphin and the River Shannon. It extended from Jamestown on the River Shannon to the north portion of Lough Ree. It was divided into three kingdoms known as Cenél Dobtha between Slieve Bawn and the River Shannon; Corca Achlann to the west and Tir Briuin na Sinna to the north. [1] The O'Monaghan's and O'Boyle's were rulers of the Three Tuathas in the 13th century.

Irish language Gaelic language spoken in Ireland and by Irish people

Irish is a Goidelic language of the Celtic languages family, itself a branch of the Indo-European language family. Irish originated in Ireland and was historically spoken by Irish people throughout Ireland. Irish is spoken as a first language in substantial areas of counties Galway, Kerry, Cork and Donegal, smaller areas of Waterford, Mayo and Meath, and a few other locations, and as a second language by a larger group of habitual but non-traditional speakers across the country.

County Roscommon County in the Republic of Ireland

County Roscommon is a county in Ireland. In the western region, it is part of the province of Connacht. It is the 11th largest Irish county by area and 27th most populous. Its county town and largest town is Roscommon. Roscommon County Council is the local authority for the county. The population of the county was 64,544 according to the 2016 census.

Ireland Island in north-west Europe, 20th largest in world, politically divided into the Republic of Ireland and Northern Ireland (a part of the UK)

Ireland is an island in the North Atlantic. It is separated from Great Britain to its east by the North Channel, the Irish Sea, and St George's Channel. Ireland is the second-largest island of the British Isles, the third-largest in Europe, and the twentieth-largest on Earth.


Corca Achlann

Corca Achlann (The People of Achlann), was once ruled by the Mac Branáin, a Uí Briuin sept, and the O'Mulvihil.

Genelach M Branain from O'Clery Book of Genealogies

Concobhar, Conn, Diermait, Maghnus, et Muircertach: clann t-Sean m Echmharcaigh m Diermada m Eachmarcaigh m Cuinn m Eachmarcaigh m Branain (o Raiter m Breanain) m Duinn sithe m Murchada m Giolla crist m Echtigheirn m Aidit m Uromain m Mail michil m Nuadhat m Flaithniadh m Ona m Aenghusa m Erca deirg m Briain m Eachdach muidhmedhon.

Genelach mc. Branan from the Book of Ballymote

Diarmaid m. Echmarchaigh m. Diarmada m. Echmharchaig m. Cuind m. Echmharcaig m. Branan m. Gilla Crist m. Cuind m. Echmharcaig m. Branan m. Duindtsidhe m. Murcaidh m. Gilli Crist m. Echthigern m. Aidith m. Uramhan m. Mailmhichil m. Nuagad m. Flaithniadh m. Ona m. Aengusa m. Earca derg m. Briain m. Ecach mugmedoin.

Annal Entries

FM1088.8 mac Giolla Criost, mic Echtighern, toiseach Corcu Achlann.

FM1120.6 Branán mac Giolla Críost, taoiseach Corca Achlann, died.

FM1150.13 Diarmaid Mac Branáin, tigherna Corc' Achlann.

FM115.13, Branán Mac Branáin, toisech Corco Achlann.

Pedigree of O'Mulvihil from O'Hart's Irish Pedigrees

Maolmichiall, son of Dungal, son of Tuathal, son of Fionnbeartach, son of Endadaidh, son of Faelan, son of Columan, son of Maoin, son of Muireadach, son of Murchada, son of Eoghain, son of Neill of the nine hostages.

(O'Hart says the O'Mulvihil where driven from county Roscommon (later medieval period) by the O'Connors to the lands of O'Brien in county Clare.)

Cenél Dobtha

Cenél Dobtha, Cenél Dofa or Doohy Hanly (Clann Dobtha), was once ruled held by the Ó hAinle (O'Hanly).

Genelach .H. Ainlighe from O'Clery Book of Genealogies

Lochlainn, Mail seclainn, Giolla na naem, Raghanll, et Cairpre riabach: clann Aedha m Conchobair m Domnaill m Iomair m Domhnaill m Amlaibh m Iomair moir m Muircertaigh (le frith an t-ech gel do bi ag Tadg ua Concobair) m Raghnaill catha briain m Murchada m Domnaill m Taidhg m Muircertaigh muirnigh m Ainlighe (o raiter muinter Ainlighe) m Urthuile m Maile duin m Cluitechair m Fuinis m Dothfa m Aengusa m Erca deirg m Briain m Echdach mugmedoin.

Genelach I Ainlighe from the Book of Ballymote

Aed & Imhar da mc. Concubair m. Domnaill m. Imhair m. Domnaill m. Amlaim m. Imhair mhoir m. Muircertaig le frit i tuac geal Taidhg m. Concubair m. Ragnaill catha Briain m. Murchada m. Domnaill m. Taidg m. Muircertaigh muirnigh m. Ainlidh o fuilet I Ainlidhe m. Uthaile m. Maeladuin m. Cluichechair m. Fuinis m. Dobhtha m. Aengusa m. Erca derg m. Briain m. Echac muigmedoin.

Tir Briuin na Sinna

Tir Briuin na Sinna, Uí Briúin na Sionna or Tir Briuin na Shannon (The land of Shannon), was once ruled held by the O'Monaghan and the O’Beirne.

H. Maenachan of Clann Ona mc. Aenghusa in the Book of Ballymote

H. Maenachan is one of the families said to descend from Ona m. Aenghusa m. Earca derg m. Briain m. Echach mugmedoin

Genelach I Birnn from the Book of Ballymote

Tadg m. Donnchada m. Domnaill m. Gilli Crist m. Imhair m. Gilli Crist m. Mathgamhna m.

Genelach hI Bern from An Leabhar Donn

Domnall ocus Uilliam Dondchad & Tadcc Cairpri & Feradach Dunadach & Rosa & In Gilla Dub clann Mailechlainn m. Briain m. Taidc m. Dondchada m. Domnaill m. Gillacrist m. Imair m. Gillacrist m. Mathgamna m. Gillacomain m. Imair m. Gillananaem m. Domnaill m. Gillacrist m. Conconnacht m. Muircertaig m. Ciaba Gorma m. Muircertaig m. Birnn m. Cinaetha m. Ubain m. Uatach m. Aeda bailb m. Indrachtaig m. Muiredaig Muillethain


  1. "Roscommon description". 2009. Retrieved 2009-11-22.

2. "Genealogies from the Book of Ballymote" transcribed by Luke Stevens.

3. "Selected genealogies from An Leabhar Donn" RIA MS 1233 (23.Q.10) transcribed by Luke Stevens 2003.

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