Donough O'Brien, 2nd Earl of Thomond ( ga, Donnchadh Ó Briain; died 1 April 1553), also known as "the fat", was the son of

Connor O'Brien, King of Thomond Connor may refer to the following: People * Connor (given name), list of people with this name * Connor (surname) * Harriet Connor Brown (1872-1962), American writer and women's rights activist Places and jurisdictions * Connor, County Antrim ...

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 (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 Earl ...

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 Nenag ...

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 ...

he 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

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