Turlogh Donn O'Brien
d. 1528
Vitals
Family
About
Turlogh Donn O'Brien, King of Thomond from 1499 until his death in 1528, ruled the O'Brien lordship in the last generation before the Tudor conquest reached Clare, the final prince of the old order in this line. He married Raghnailt MacNamara, and behind him the wired descent runs unbroken, generation by named generation, to Brian Boru.
Research notes
✓ DOCUMENTED (Burke's Peerage, INCHIQUIN (O'Brien of Thomond) lineage pp.2033-34, photographed & read 23 Jul 2026.): TURLOGH DONN O'BRIEN, PRINCE OF THOMOND (Burke's '1499' is the year he became O'Brien, not his birth - see update); m. 1st RAGHNAILT, dau. of John Macnamara of Clancullen. Father of Conor, Prince of Thomond (our line). *** GAP NOW FILLED 23 Jul 2026 (O'Hart pedigree, gen. 120): Turlogh Donn (No.120) = son of Teige an-Chomhaid (No.119, I99660); the full continuous descent to Brian Boru is now WIRED (I99632-661). [Superseded note:] Burke's Inchiquin had compressed this as "ANCESTOR IN THE 13TH GENERATION OF" - i.e. descends across ~13 generations Burke's does not print from - TURLOGH O'BRIEN, HIGH KING OF IRELAND (d. 1086), who was the GRANDSON of BRIAN BORU (Brian Boroimhe), Chief of the Dal gCais, Prince of Thomond, HIGH KING OF IRELAND from 1002, victor over the Danes and slain at his moment of triumph at the BATTLE OF CLONTARF, 23 April 1014. So the O'Brien line reaches Ireland's most famous High King - BUT with a ~13-generation stretch Burke's compresses: BRIAN BORU and TURLOGH the High King are kept NOTE-ONLY here (as Cerdic above Alfred, the Norman dukes above the Conqueror). To WIRE the continuous Dalcassian descent needs O'Hart's O'Brien pedigree (or the Irish annals), which names every intervening king/prince of Thomond. Direct ancestor - top of the wired O'Brien spine. Added 23 Jul 2026. UPDATE 25 Oct 2026 (Annals of the Four Masters): AFM 1528.2 - 'O'Brien (Turlough, the son of Teige), who of all the Irish in Leath Mhogha had spent the longest time in acts of nobility and hospitality, the worthy heir of Brian Boru in maintaining war against the English, died... and his son Conor Mac Turlough was appointed to his place.' He became O'Brien in 1499 (the '1499' Burke's gives is his accession, not a birth); his first wife Raghnailt MacNamara died in 1486 while he was still 'Lord of East Thomond' (AFM 1486.27), so he was born well before 1470. Father Teige an Chomhaid confirmed by AFM 1523.7 ('Teige-an-Chomhaid, son of Torlogh, who was son of Brian Chatha-an-Aonaigh'). Birth date removed; death 1528 added.