E
Eachraidh (O'Brien)
shown under married name (maiden name not established)
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About
Eachraidh was a daughter of Ceaibhall, son of Olioll Fionn, and the second wife of Brian Boru. She was the mother of his son Teige, from whom this family descends, and of another son who fell fighting in Connacht.
Research notes
✓ (O'Hart, Irish Pedigrees (1892), 'O'Brien (No.1) King of Thomond', gen. nos. as cited; corroborated by the Annals of the Four Masters and by the DC782/R-L226 O'Brien Y-DNA study (which independently numbers this same descent 105 Brian Boru -> 120 Turlogh Donn). Wired 23 Jul 2026.): EACHRAIDH, dau. of Ceaibhall, son of Olioll Fionn; 2nd wife of Brian Boru and mother of his son Teige (our line) and of Donal (who fell fighting the Conacians). Direct ancestress. Added 23 Jul 2026.