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Donnchadh Cairbreach Ó Briain

Donnchadh Cairbreach Ó Briain (died 1242), a son of Domnall Mór, became King of Thomond after his father's sons fought over the succession. In the 1210s he founded Ennis Friary as penance for his feud with his brother.

When rival clans revolted, he crushed them with Norman help from his brother-in-law de Burgh, paying for it by granting Limerick and surrounding lands to the colonists; Thomond was reduced to the area of modern County Clare behind the Shannon. He died in 1242.

References

  1. en.wikipedia.org/wiki/Donnchadh_Cairbreach_Ó_Briain
  2. en.wikipedia.org/wiki/Domnall_Mór_Ua_Briain