Donough O'Brien, 2nd Earl of Thomond
|2nd Earl of Thomond & Baron Ibrackan|
|Died||1 April 1553|
|Noble family||Ua Briain|
|Father||Connor O'Brien, King of Thomond|
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.
Children of Donough O'Brien and Helen Butler:
- Margaret O'Brien (d. 1568) married Dermod O'Brien, 2nd Baron Inchiquin
- Connor O'Brien, 3rd Earl of Thomond (c. 1535–1581)
- Donal or Daniel
- Honora married Teige Macnamara
O'Brien also fathered an illegitimate daughter, Mary, who married Theobald Burke, son of William Burke, 1st Baron Bourke of Castleconnell.
- 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.
- 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.
- Lodge, John; Archdall, Mervyn (1789). The peerage of Ireland: or, A genealogical history of the present nobility of that kingdom. 2. Dublin: James Moore. pp. 27–30. Retrieved 28 December 2011.
|Peerage of Ireland|
|New creation||Baron Ibrackan
|Earl of Thomond
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