Diarmait Ua Briain

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Diarmait Ua Briain (English: Dermot O'Brien) (1060-1118) was a 11th century Irish chieftain who ruled Munster from 1114 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. He is believed to have been the commander of the Irish fleet that supported Rhys ap Tewdwr at the Battle of Mynydd Carn. [1]

In 1093, he reconciled with Muirchertach after recognizing his claim and was installed as dux of Waterford. 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. This resulted in Muirchertach making peace with Diarmait, [2] however he was eventully captured by Muircheartach.

He later died in Cork in 1118, Toirdelbach Ua Conchobair invaded Munster and partitioned the land between the sons of Diarmait Ua Briain and Tadg Mac Carthaig, Conchobar Ua Briain of Thomond and Toirdelbach Mac Carthaig of Desmond respectively. [3]

[edit] References

  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
Diarmait Ua Briain
Regnal titles
Preceded by
Muircheartach Ua Briain		 King of Munster
1114 – 1118		 Succeeded by
Conchobar Ua Briain and Toirdelbach Mac Carthaig