Donough O'Brien, 2nd Earl of Thomond

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Donough O'Brien
2nd Earl of Thomond & Baron Ibrackan
Died 1 April 1553
Noble family Ua Briain
Spouse(s) Helen Butler
Father Connor O'Brien, King of Thomond
Mother Annabell Burke

Donough O'Brien, 2nd Earl of Thomond (died 1 April 1553), also known as "the fat",[1] was the son of Connor O'Brien, King of Thomond and Annabell Burke.

O'Brien married Helen Butler, daughter of Piers Butler, 8th Earl of Ormonde and Lady Margaret Fitzgerald. He died on 1 April 1553, after being attacked by his brothers at the family seat of Clonroad. O'Brien's brother Donald was named king of Thomond by the Dalgais, but O'Brien's son, Connor, allied himself with the English and regained control of his lands.[2]

Children of Donough O'Brien and Helen Butler:

O'Brien also fathered an illegitimate daughter, Mary, who married Theobald Burke, son of William Burke, 1st Baron Bourke of Castleconnell.


  1. ^ Cokayne, George Edward, ed. (1896). Complete peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, extant, extinct or dormant (S to T). 7 (1st ed.). London: George Bell & Sons. p. 391. Retrieved 28 December 2011. 
  2. ^ O'Donoghue, John (1860). Historical memoir of the O'Briens: with notes, appendix, and a genealogical table of their several branches. Hodges, Smith, & Co. pp. 187–188. Retrieved 28 December 2011. 

Further reading[edit]

Peerage of Ireland
New creation Baron Ibrackan
Succeeded by
Connor O'Brien
Preceded by
Murrough O'Brien
Earl of Thomond