Ui Failghe seems to have existed as a kingdom in 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...

 since at least the early historic era, and successfully fought off encrochments by the Uí Néill

Uí Néill

The Uí Néill are Irish and Scottish dynasties who claim descent from Niall Noigiallach , an historical King of Tara who died about 405....

, the Eóganachta

Eóganachta

The Eóganachta or Eoghanachta were an Irish dynasty centred around Cashel which dominated southern Ireland from the 6/7th to the 10th centuries, and following that, in a restricted form, the Kingdom of Desmond, and its offshoot Carbery, well into the 16th century...

, and most especially the Normans

Normans

The Normans were the people who gave their name to Normandy, a region in northern France. They were descended from Norse Viking conquerors of the territory and the native population of Frankish and Gallo-Roman stock...

. From the mid eleventh century its dynasty adopted the surname Ua Conchobhair Failghe, or O Connor Faly (they were unrelated to the other notable Ua Conchobhair dynasties of Connacht and Kerry). Their seat was originally in Rathangan

Rathangan

Rathangan may refer to:*Rathangan, County Kildare*Rathangan, County Wexford...

, County Kildare

County Kildare

County Kildare is a county in Ireland. It is part of the Mid-East Region and is also located in the province of Leinster. It is named after the town of Kildare. Kildare County Council is the local authority for the county...

 but moved to Daingean

Daingean

Daingean , formerly Philipstown, is a small town in east County Offaly, Ireland. It is situated midway between the towns of Tullamore and Edenderry on the R402 regional road. The town or townland of Daingean has a population of 777 while the District Electoral Division has a total population of...

 with the Norman arrival

Norman Invasion of Ireland

The Norman invasion of Ireland was a two-stage process, which began on 1 May 1169 when a force of loosely associated Norman knights landed near Bannow, County Wexford...

.

In the 1530s Brian supported the revolt of Silken Thomas; on his defeat he was pardoned and was given the title "Baron of Offaly".

On the death of the last de facto

De facto

De facto is a Latin expression that means "concerning fact." In law, it often means "in practice but not necessarily ordained by law" or "in practice or actuality, but not officially established." It is commonly used in contrast to de jure when referring to matters of law, governance, or...

 king, and de jure

De jure

De jure is an expression that means "concerning law", as contrasted with de facto, which means "concerning fact".De jure = 'Legally', De facto = 'In fact'....

 baron, Brian mac Cathaoir O Conchobhair Failghe, in about 1556, Ui Failghe was shired into King's County

County Offaly

County Offaly is a county in Ireland. It is part of the Midlands Region and is also located in the province of Leinster. It is named after the ancient Kingdom of Uí Failghe and was formerly known as King's County until the establishment of the Irish Free State in 1922. Offaly County Council is...

 by Mary I of England during one of the Plantations of Ireland. Upon Irish independence it was renamed as County Offaly

County Offaly

County Offaly is a county in Ireland. It is part of the Midlands Region and is also located in the province of Leinster. It is named after the ancient Kingdom of Uí Failghe and was formerly known as King's County until the establishment of the Irish Free State in 1922. Offaly County Council is...

.

Early kings

• Failge Berraide
  Failge Berraide
  Failge Berraide was a King of the Uí Failge of County Offaly.His exact identity is not known. As the eponymous ancestor of the Uí Failge he may be associated with Rus Failge, the son of the high king of Ireland, Cathair Mór, said to have lived in the early 2 cd century. This is the ancestor...
  
   (flourished 507-514)
• Bruidge mac Nath Í
  Bruidge mac Nath Í
  Bruidge mac Nath Í was a king of the Uí Failge, a Laigin people of County Offaly. He was the grandson of Failge Berraide, the eponymous ancestor of the dynasty....
  
   (died 579)
• Áed Rón mac Cathail
  Áed Rón mac Cathail
  Áed Rón mac Cathail was a king of the Uí Failge, a Laigin people of County Offaly. He was the grandson of Bruidge mac Nath Í , a previous king....
  
   (died 604)
• Ailill mac Áedo Róin
  Ailill mac Áedo Róin
  Ailill mac Áedo Róin was a king of the Uí Failge, a Laigin people of County Offaly. He was the son of Áed Rón mac Cathail , a previous king....
  
   (died 639)
• Cillíne mac Forannáin
  Cillíne mac Forannáin
  Cillíne mac Forannáin was a king of the Uí Failge, a Laigin people of County Offaly. He was the great grandson of a brother of Áed Rón mac Cathail , a previous king....
  
   (died 652)
• Fland Dá Chongal
  Fland Dá Chongal
  Fland Dá Chongal or Flann Ua Congaile was a king of the Uí Failge, a Laigin people of County Offaly.Fland is not mentioned in the annals of Ireland but appears in king lists and genealogies...
  
  
• Forbassach Ua Congaile
  Forbassach Ua Congaile
  Forbassach Ua Congaile was a king of the Uí Failge, a Laigin people of County Offaly.The king lists in the Book of Leinster give him a reign of three years giving a possible reign of 711–714. He was related to his predecessor Fland Dá Chongal but the exact relationship is unclear. The Uí Failge...
  
   (died 714)
• Ailill Corrach mac Flainn
  Ailill Corrach mac Flainn
  Ailill Corrach mac Flainn was a king of the Uí Failge, a Laigin people of County Offaly. He was one of the many sons of Fland Dá Chongal, a previous king. He ruled from 714 to 741. The byname Corrach means unsteady....
  
   (died 741)
• Flaithnia mac Flainn
  Flaithnia mac Flainn
  Flaithnia mac Flainn was a king of the Uí Failge, a Laigin people of County Offaly. He was one of the many sons of Fland Dá Chongal, a previous king. He ruled from 741 to 755....
  
   (died 755)
• Cummascach mac Flainn
  Cummascach mac Flainn
  Cummascach mac Flainn was a king of the Uí Failge, a Laigin people of County Offaly. He was one of the many sons of Fland Dá Chongal, a previous king. He ruled from 755 to 757...
  
   (died 757)
• Cináed mac Flainn
  Cináed mac Flainn
  Cináed mac Flainn was a king of the Uí Failge, a Laigin people of County Offaly. He was one of the many sons of Fland Dá Chongal, a previous king. He ruled from 757 to 770...
  
   (died 770)
• Mugrón mac Flainn
  Mugrón mac Flainn
  Mugrón mac Flainn was a king of the Uí Failge, a Laigin people of County Offaly. He was one of the many sons of Fland Dá Chongal, a previous king. He ruled from 770 to 782...
  
   (died 782).
• Domnall mac Flaíthnia
  Domnall mac Flaíthnia
  Domnall mac Flaíthnia was a king of the Uí Failge, a Laigin people of County Offaly. He was the son of Flaithnia mac Flainn , a previous king. He ruled from 782 to 783....
  
   (died 783)
• Óengus mac Mugróin
  Óengus mac Mugróin
  Óengus mac Mugróin was a king of the Uí Failge, a Laigin people of County Offaly. He was the son of Mugrón mac Flainn , a previous king. He ruled from 783 to 803....
  
   (died 803)
• Flaíthnia mac Cináeda
  Flaíthnia mac Cináeda
  Flaíthnia mac Cináeda was a king of the Uí Failge, a Laigin people of County Offaly. He was the son of Cináed mac Flainn , a previous king. He ruled from 803-806....
  
   (died 806)
• Cináed mac Mugróin
  Cináed mac Mugróin
  Cináed mac Mugróin was a king of the Uí Failge, a Laigin people of County Offaly. He was the son of Mugrón mac Flainn , a previous king. He ruled from 806 to 826....
  
   (died 829)

Later kings c.1051-c.1556

• Congalach Ua Conchobair, d. 1051
• Gilla Patraic mac Conchobair Ua Sibleain, 1051-1071
• Conchobar mac Congalaig, 1071-1115
• Muirchertach, ?-1095
• Rogan mac Domnaill meic Conchobair, 1115-c.1118
• Cu Faifne mac Congalaig, c.1118-1130
• Donnchad mac Con Faifne, 1130-1134
• Aed mac Domnaill, 1134-????
• Mael Morda mac Conchobair
• Conchobair mac Con Faifne
• Mael Sechlainn mac Conchobair
• Congalach mac Con Faifne
• Murchad mac Con Faifne
• Muirchertach mac Muirchertaig (Int Athchlerch), ????-c.1151
• Aed mac Donnchada (Gilla na Findmona), c.1151-1159
• Domnall Ruad mac Congalaig, 1159-1161
• Mael Sechlainn mac Congalaig, 1161-1164
• Donchad Ruad Roigne, 1164-????
• Diarmait mac Congalaig,
• Muirchertach mac Congalaig, ????-1169?
• Diarmait mac Con Broga Ua Dimmusaig, after 1172-1193
• Muirchertach mac Brian, fl. 1212
• Mael Morda mac Muirchertaig meic Donnchada, ????-1225
• Muirchertach mac Mael Morda, 1225-????
• Muirchertach mac Muirchertaig, ????-c. 13 June 1305
• Murchad mac Muirchertaig, 1305-????
• Mael Sechlainn mac Muirchertaig, ????-1329
• Muirchertach Óg mac Muircherartaig, ????-1384
• Murchad mac Muircheartaig Óg, 1384-1421
• Diarmaid mac Muirchertaigh Óg, 1421-c. 1425
• An Calbhach Mór mac Murchada, c. 1425-1458 (see Máireg Béan Ó Conchubhair Fáilghe
  Máireg Béan Ó Conchubhair Fáilghe
  Máireg Bean Ui Chonchubhair Fáilghe was an Irish noblewoman and arts patron.-Biography:A daughter of Tadc Ó Céarbhaill of Ely and Queen of the Kingdom of Uí Failghe , her husband being An Calbach Mor Ó Conchubhair Fáilghe, one of the last Kings of Ui Failghe.Máireg was famous in her day as a...
  
  )
• Conn mac an Chalbhaig, 1458-autumn 1474
• Cathaoir mac Cuinn, 1474-1511
• Brian mac Taidhg meic an Chalbhaigh, 1511-1517
• An Calbhach mac Taidhg, 1517-c. 1525
• Brian mac Cathaoir, c. 1525 - c. 1556

Sources

• "O'Connor Faly: O Conchobhair Failghe, Kings of Ui Failghe, a.1051-c.1556", page 217-18, "A New History of Ireland", volume nine, Oxford, 1984.
• Mac Niocaill, Gearoid (1972), Ireland before the Vikings, Dublin: Gill and Macmillan
• Book of Leinster: Rig Hua Falge at University College Cork