Diarmait Ua Briain

Diarmait Ua Briain(1060 –1118) was an 11th-century Irish king who ruledMunsterfrom1114to 1118.

One of three sons ofToirdelbach Ua Briain,he was banished from Munster by his brotherMuirchertach Ua Briainshortly after the death of their father in 1086. He lived in exile for several years while his brother ruled asKing of Munster.He is believed to have been the commander of the Irish fleet that supportedRhys ap Tewdwrat theBattle of Mynydd Carn.^[1]

In 1093, he reconciled with Muirchertach after recognizing his claim and was installed asduxofWaterford.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 andBrian Ua Briain"in violation of a mutual oath on the relics of Ireland"besiegingLimerick.This resulted in Muirchertach making peace with Diarmait^[2]but he was eventually captured by Muircheartach.

He later died inCorkin 1118 and in the same year,Toirdelbach Ua Conchobairinvaded Munster and partitioned the land between the sons of Diarmait Ua Briain andTadg Mac Carthaig,Conchobar Ua BriainofThomondandToirdelbach Mac CarthaigofDesmondrespectively.^[3]

Family

He married Mór Ua Conchobair, daughter ofRuaidrí Ua Conchobair[(anglicised Roderic O'Connor), called Ruaidrí na Saide Buide], King of Connacht (died 1118) and had two sons:^[4]

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(died 1164)

Source:^[5]

References

^Hollister, Charles Warren; Donald F. Fleming and Janet M. Pope, ed.Henry I and the Anglo-Norman World: Studies in Memory of C. Warren.Woodbridge, United Kingdom: Boydell Press, 2007. (pg. 53)ISBN 1-84383-293-3
^Flanagan, Marie Therese.Irish Royal Charters: Texts and Contexts.New York: Oxford University Press, 2005. (pg. 148)ISBN 0-19-926707-3
^Moody, T.W.; F.J. Byrne and F.X. Martin, ed.A New History of Ireland.New York: Oxford University Press, 1982. (pg. 55, 59)ISBN 0-19-821744-7
^Dobbs, Margaret E. [ed. and tr.], "The Ban-shenchus [part 2]",Revue Celtique 48 (1931): 191: (" Mor ingen Ruaidri hUi Conchobair, mathair Muirchertag 7 Diarmata da mac Domnaill; 7 isi mathair da mac Diarmada (ob. 1118) hUi Briain I. Tairrdealbach 7 Tadc (ob. 1154) ".).
^John O'Hart,"Irish Pedigrees or the Origin and Stem of the Irish Nation", Volume 1, 1892, page 157,https://archive.org/stream/irishpedigreesor_01ohar#page/157

Regnal titles
Diarmait Ua Briain Dál gCais
Preceded by Muircheartach Ua Briain	King of Munster 1114–1118	Succeeded by Conchobar Ua BriainandToirdelbach Mac Carthaig

[1] Hollister, Charles Warren; Donald F. Fleming and Janet M. Pope, ed.Henry I and the Anglo-Norman World: Studies in Memory of C. Warren.Woodbridge, United Kingdom: Boydell Press, 2007. (pg. 53)ISBN 1-84383-293-3

[2] Flanagan, Marie Therese.Irish Royal Charters: Texts and Contexts.New York: Oxford University Press, 2005. (pg. 148)ISBN 0-19-926707-3

[3] Moody, T.W.; F.J. Byrne and F.X. Martin, ed.A New History of Ireland.New York: Oxford University Press, 1982. (pg. 55, 59)ISBN 0-19-821744-7

[4] Dobbs, Margaret E. [ed. and tr.], "The Ban-shenchus [part 2]",Revue Celtique 48 (1931): 191: (" Mor ingen Ruaidri hUi Conchobair, mathair Muirchertag 7 Diarmata da mac Domnaill; 7 isi mathair da mac Diarmada (ob. 1118) hUi Briain I. Tairrdealbach 7 Tadc (ob. 1154) ".).

[5] John O'Hart,"Irish Pedigrees or the Origin and Stem of the Irish Nation", Volume 1, 1892, page 157,https://archive.org/stream/irishpedigreesor_01ohar#page/157

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