MACECHACH Brión

Abt 0350 - Abt 0425  (75 years)

• Name	MACECHACH Brión
  Birth	Abt 0350	Dublin, Ireland
  Gender	Male
  Death	Abt 0425	Damchluain, Galway, Ireland
  Notes	Brión mac Echach Muigmedóin was a son of Eochaid Mugmedón and Mong Finn Fiodhaig (whose brother was king of Munster); and was an older half-brother of Niall Eochaid (Niall of the Nine Hostages). Their descendants became known as the Connachta. When his brother Niall became High King, Brión became King of Connaught. Fiachrae, a third brother made war against Brión, loosing against Brión; but Fiachrae's son Nath continued their struggle against Brión, killing him in 388; in the second Battle of Damchluain, now known as Tuam, county Galway. [1] [2] Brión's descendants formed the Irish kin group Uí Briúin. Eochaidh Muighmeadhon, had twenty-four sons, who were contemporaries of Laoghaire, son of Niall. Their leader was Eichen, the youngest was Duach Galach who later became King. [3] four Sons: [4] Brian Fiachra Ailill Fergus The three major septs of the Uí Briúin are - [5] - Uí Briúin Aí, occupying the lands around the centre of Connacht, Cruachan in modern County Roscommon included; the Síol Muireadaigh (Ó Conchubhair O'Connors), the MacDermots, and the Síl Cathail. - Uí Briúin Bréifne, in County Cavan and County Leitrim including the Ó Raghallaigh (O'Reillys) and Ó Ruairc (O'Rourkes) - Uí Briúin Seóla, centred on Maigh Seóla in modern County Galway including the Ó Flaithbheartaigh kings of Iar Connacht, the Clann Cosgraigh Sources ↑ The Irish Empire: The Story of Niall of the Nine Hostages page: 97 - by Clayton N. Donoghue - pub: FriesenPress 2015 ↑ High King of Ireland, Brian Orbsen, King of Connaught was killed at the Battle of Dam Chluain, near Tuam, circa A.D. 388. Centre for Island Studies : Clare Island ↑ Celt : The History of Ireland lll p:28 by Geoffrey Keating corpus of electronic texts edition ↑ Celtic Literature Collective : Death of Eochaidh Muighmedóin’s three sons: Brian, Ailill, Fiachra ↑ Wikipedia : Uí Briúin. See also: The Celtic Literature Collective : Death of Crimthann son of Fidach, and of Eochaidh Muighmedóin’s three sons: Brian, Ailill, Fiachra Wikipedia : Brión mac Echach Muigmedóin Wikidata: Item Q3644835, en:Wikipedia help.gif Bart Jaski Genealogical tables of medieval Irish royal dynasties Table-1, 6 & 60 Early Irish Kingship Succession by Jaski Bart, Published by Four Courts Press, 2013, ISBN 1846824265 ISBN 9781846824265
  Person ID	I59346	Freeman-Smith
  Last Modified	27 Jan 2026

  
  

  Father	mac MUIREADACH Eochaid Mugmedón,   b. Abt 0325, Ireland d. Abt 0365, Ireland (Age 40 years)
  Relationship	natural
  Mother	FIODHAIG Mong Finn,   b. Abt 0320, Ireland d. Abt 0365, Ireland (Age 45 years)
  Relationship	natural
  Family ID	F26363	Group Sheet  |  Family Chart

  
  

  Family	CHASDUBH Inne Cairenn,   b. Abt 0355, England d. Ireland
  Children	1. BRIUIN Feldelm Foltchain ui,   b. Tara, Ireland d. Abt 0535, Dalriada, Argyll, Scotland  [Father: natural]  [Mother: natural]
  Family ID	F26362	Group Sheet  |  Family Chart
  Last Modified	27 Jan 2026