Donough O'Brien, 2nd Earl of Thomond

Margaret O'Brien
Connor O'Brien, 3rd Earl of Thomond
Donal O'Brien
Honora O'Brien

FatherConnor O'Brien, King of ThomondMotherAnnabell Burke

Donough O'Brien, 2nd Earl of Thomond (Irish: Donnchadh Ó Briain; died 1 April 1553), also known as "the fat",^[1] was the son of Connor O'Brien, King of Thomond and Annabell Burke. He inherited the earldom from his uncle, Murrough O'Brien, by special remainder.^[2]

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 Sir 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.^[3]

Children of Donough O'Brien and Helen Butler:

Margaret O'Brien (d. 1568) married Dermod O'Brien, 2nd Baron Inchiquin [she was (also) married to the 2nd Earl of Clanricard according to the Wikipedia entry for him: Richard Burke, 2nd Earl of Clanricarde
Connor O'Brien, 3rd Earl of Thomond (c. 1534 – 1581)
Donal or Daniel
Honora married Teige Macnamara

Notes

^ Deduced from:
• Minor at his father's death at 1540. (below 21) (see History of the O'Briens from Brian Boroimhe, AD. 1000 to AD. 1945, Donough O'Brien, page 61, https://archive.org/details/historyofobriens00obri/page/60/mode/2up)
• Old enough to bear his own son before his death in 1553, who was politically active by 1559.

References

^ Cokayne, George Edward, ed. (1896). Complete peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, extant, extinct or dormant (S to T). Vol. 7 (1st ed.). London: George Bell & Sons. p. 391. Retrieved 28 December 2011.
^ Chisholm, Hugh, ed. (1911). "Thomond, Earl and Marquess of" . Encyclopædia Britannica. Vol. 26 (11th ed.). Cambridge University Press. p. 869.
^ 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.