Donough O'Brien, 2nd Earl of Thomond (; died 1 April 1553), also known as "the fat", 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. O'Brien married Helen Butler, daughter of

Piers Butler, 8th Earl of Ormonde Piers Butler, 8th Earl of Ormond, 1st Earl of Ossory (26 August 1539) also known as Red Piers ( Irish ''Piers Ruadh''), was from the Polestown branch of the Butler family of Ireland. In the succession crisis at the death of Thomas Butler, 7th ...

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 Thomond ( Classical Irish: ; Modern Irish: ), also known as the Kingdom of Limerick, was a kingdom of Gaelic Ireland, associated geographically with present-day County Clare and County Limerick, as well as parts of County Tipperary around Nena ...

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 Dermod McMurrough O'Brien (died 1 May 1557) was the 2nd Baron Inchiquin. He was the son of Murrough O'Brien, 1st Earl of Thomond and Eleanor FitzGerald. O'Brien married Margaret O'Brien, daughter of Donough O'Brien, 2nd Earl of Thomond (a nephew ...

, and

Richard Burke, 2nd Earl of Clanricarde Richard Burke, 2nd Earl of Clanricarde ( ; died 24 July 1582), styled Lord Dunkellin ( ) until 1544, was an Irish noble who succeeded his father Ulick na gCeann Burke, 1st Earl of Clanricarde as chief of a Gaelicised Norman family with autho ...

Connor O'Brien, 3rd Earl of Thomond Connor O'Brien, 3rd Earl of Thomond also spelt Conor and called Groibleach, or the "long-nailed", (; 1535–1581) contended with his uncle Domhnall mac Conchobair Ó Briain, Donnell for the Chieftainship of Clan O'Brien dynasty, O'Brien from 15 ...

(c. 1534 – 1581) *Donal or Daniel *Honora married Teige Macnamara

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