Diarmait Ua Briain (1060 –1118) was an 11th-century Irish king who ruled Munster from

1114 Year 1114 ( MCXIV) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar. Events By place Europe * January 7 – Emperor Henry V marries Matilda (or Maude), 11-year-old daughter of ...

to 1118. One of three sons of Toirdelbach Ua Briain, he was banished from Munster by his brother Muirchertach Ua Briain shortly after the death of their father in 1086. He lived in exile for several years while his brother ruled as

King of Munster The kings of Munster ( ga, Rí Mumhan), ruled from the establishment of Munster during the Irish Iron Age, until the High Middle Ages. According to Gaelic traditional history, laid out in works such as the '' Book of Invasions'', the earliest ...

. He is believed to have been the commander of the Irish fleet that supported Rhys ap Tewdwr at the

Battle of Mynydd Carn The Battle of Mynydd Carn took place in 1081, as part of a dynastic struggle for control of the Welsh kingdoms of Gwynedd and Deheubarth. The result of the battle had a radical effect on the history of Wales. The battle is recorded in the near ...

. In 1093, he reconciled with Muirchertach after recognizing his claim and was installed as ''dux'' of

Waterford "Waterford remains the untaken city" , mapsize = 220px , pushpin_map = Ireland#Europe , pushpin_map_caption = Location within Ireland##Location within Europe , pushpin_relief = 1 , coordinates ...

. He eventually succeeded his brother as acting King of Munster when his brother became seriously ill in 1114. After taking the throne, he banished Muircheartach and soon was involved in a four-year struggle for control of Munster. In 1116, he attacked Muirchertach and Brian Ua Briain ''"in violation of a mutual oath on the relics of Ireland"'' besieging

Limerick Limerick ( ; ga, Luimneach ) is a western city in Ireland situated within County Limerick. It is in the province of Munster and is located in the Mid-West which comprises part of the Southern Region. With a population of 94,192 at the 2016 ...

. This resulted in Muirchertach making peace with Diarmait but he was eventually captured by Muircheartach. He later died in Cork in 1118 and in the same year,

Toirdelbach Ua Conchobair Toirdhealbhach Mór Ua Conchobhair (old spelling: Tairrdelbach Mór Ua Conchobair; 1088 – 1156) anglicised Turlough Mór O'Conor, was King of Connacht (1106–1156) and High King of Ireland (ca. 1120–1156). Family background and early life ...

invaded Munster and partitioned the land between the sons of Diarmait Ua Briain and Tadg Mac Carthaig,

Conchobar Ua Briain Conchobar Ua Briain (died 1142) was a mid-twelfth-century ruler of the kingdoms of Munster and Dublin. Conchobar was a son of Diarmait Ua Briain, King of Munster. In 1138, Conchobar assumed the kingship of Munster. The ''Annals of the Four ...

Thomond Thomond (Classical Irish: ; Modern Irish: ), also known as the kingdom of Limerick, was a kingdom of Gaelic Ireland, associated geographically with present-day County Clare and County Limerick, as well as parts of County Tipperary around Nena ...

and Toirdelbach Mac Carthaig of Desmond respectively.

Family

He married Mór Ua Conchobair, daughter of

Ruaidrí Ua Conchobair Ruaidrí mac Tairrdelbach Ua Conchobair ( Modern Irish: Ruairí Ó Conchúir; anglicized as Rory O'Conor) ( – 2 December 1198) was King of Connacht from 1156 to 1186, and High King of Ireland from 1166 to 1198. He was the last High King o ...

anglicised Roderic O'Connor), called Ruaidrí na Saide Buide King of Connacht (died 1118) and had two sons: *Tadc (Tadhg) (died 1154) * Toirdhealbhach (died 1167) He had two other sons by unknown wives or mistresses: * Cochobhar na Cathrach (died 1142) *Donnchad,

Bishop of Killaloe The Bishop of Killaloe ( ) is an episcopal title which takes its name after the town of Killaloe in County Clare, Ireland. In the Roman Catholic Church it remains a separate title, but in the Church of Ireland it has been united with other bish ...

(died 1164) Source:

John O'Hart John O'Hart (1824–1902) was an Irish genealogist. He was born in Crossmolina, County Mayo, Ireland. A committed Roman Catholic and Irish nationalist, O'Hart had originally planned to become a priest but instead spent two years as a poli ...

,"Irish Pedigrees or the Origin and Stem of the Irish Nation", Volume 1, 1892, page 157, https://archive.org/stream/irishpedigreesor_01ohar#page/157

References

{{DEFAULTSORT:Ua Briain, Diarmait 1060 births 1118 deaths Kings of Munster 12th-century Irish monarchs Diarmait 11th-century Irish people