Murchad mac Brain Mut
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Murchad mac Brain Mut was King of Leinster and died in 727. In 722 he routed the High King, Fergal mac Maele Duin, at the battle of Allen, one of the celebrated Leinster victories of the period.
Research notes
✓ DOCUMENTED (Source: the Uí Fáeláin / Uí Dúnlainge royal genealogy of Leinster, attested in the Irish Annals and the medieval tracts (Book of Leinster; Rawlinson B502 - Genelach h-Úa n-Dúnlainge); supplied 23 Jul 2026.): MURCHAD MAC BRAIN MUT, KING OF LEINSTER; d. 727 - famously ROUTED THE HIGH KING FERGAL MAC MAELE DUIN at the BATTLE OF ALLEN (Almu), 722. Father of Faelan the eponym. Direct ancestor. Added 23 Jul 2026. ||AUDIT 8 Oct 2026 - STEPMOTHER TRAP (do not wire)|| His only recorded wife CONCHENN (d.743, annal obit), dau. of CELLACH CUALANN (d.715) of Ui Mail, overking of Leinster, is NOT wired as an ancestress: DIB reasons she married Murchad c.710, AFTER his elder sons were born, so our rung Faelan (d.738) was probably her STEPSON; only Muiredach (d.760) is credited to her. Genealogy sites make her mother of all the sons - do not re-import. His own mother Almaith of Dal Riata = Banshenchas-only, note-only.