Brian Dubh O'Brien founder of Carrigogunnell

✓ as a name and position: Brian Dubh (Brien Duff) O'Brien, founder of the O'Briens of Carrigogunnell, co. Limerick, 'who gave name to the barony of Pobble Brien' - named as the stem of the line in both AFM patronymics (1580.12 '... son of Donough, son of Brian Duv O'Brien'; 1585.19 '... son of Mahon, son of Donough, son of Brian Duv O'Brien'). His parentage is pedigree-grade (~): Lodge II p.22 - Connor O'Brien, King of Thomond, 'married Mary, daughter of Teige O'Brien, chief of the Counagh family, by whom he had Dermod, who died without issue; Brien-Duff, ancestor to the O'Brien's of Carrigoginniol, or the country of Poble O'Brien in county of Limerick ...; and Donal, who appears to have been Bishop of Limerick'; O'Donoghue the same. Father of Donough I. Source: Annals of the Four Masters (O'Donovan ed.) 1426.4, 1580.12, 1585.19, CELT T100005D-E, read 27 Oct 2026; Source: Lodge, Peerage of Ireland (1789), vol. II, 'O'Brien, Earl of Inchiquin' pp.21-22 (Dr O'Brien's pedigree) (archive.org peerageofireland02lodg); O'Donoghue, Historical Memoir of the O'Briens (1860) (archive.org historicalmemoi00odogoog); both read 27 Oct 2026. [DIRECT ANCESTOR OF THE COMPILER: flag added 27 Oct 2026 by walking the tree from Aynsley, so that this marker is reliable and can be searched.]