The Three Tuathas was a name of a kingdom consisting of three kingdoms in County Roscommon

County Roscommon

County Roscommon is a county in Ireland. It is located in the West Region and is also part of the province of Connacht. It is named after the town of Roscommon. Roscommon County Council is the local authority for the county...

, Ireland

Ireland

Ireland is an island to the northwest of continental Europe. It is the third-largest island in Europe and the twentieth-largest island on Earth...

 lying between Elphin

Elphin, County Roscommon

Elphin, sometimes spelt Elfin , is a village in north County Roscommon, Ireland. It forms the southern tip of a triangle with Boyle and Carrick-on-Shannon to the north west and north east respectively. It is at the junction of the R368 and R369 regional roads...

 and the River Shannon

River Shannon

The River Shannon is the longest river in Ireland at . It divides the west of Ireland from the east and south . County Clare, being west of the Shannon but part of the province of Munster, is the major exception...

. It extended from Jamestown

Jamestown, County Leitrim

Jamestown is a village on the banks of the River Shannon in County Leitrim, Ireland. It lies some 5 km east-south-east of the county town, Carrick-on-Shannon....

 on the River Shannon to the north portion of Lough Ree

Lough Ree

Lough Ree is a lake in the midlands of Ireland, the second of the three major lakes on the River Shannon. Lough Ree is the second largest lake on the Shannon after Lough Derg. The other two major lakes are Lough Allen to the north, and Lough Derg to the south, there are also several minor lakes...

. 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. The O'Manachain's and O'Boyle's were rulers of the Three Tuathas in the 13th century.

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