mac FEIDEILMID Cathair Mór

Abt 0090 - Abt 0122  (32 years)

• Name	mac FEIDEILMID Cathair Mór
  Birth	Abt 0090	Leinster, Ireland
  Gender	Male
  Death	Abt 0122	Mag Aga, Ireland
  Notes	Cathair Mór (Mar) was son Fedlimid Fir Urglais and a High King of Ireland according to Irish legend and mythology. [1] He succeeded Felim Rachtmar, and reigned for for three years. The dates for his reign are given variously as 113 – 116; [2] 119 - 122 [3] [4] He was killed battle at Mag Aga against Conn of a Hundred Battles.[5] Cathair had many sons. His testament describes the sons and their inheritance:[5] Rus Failgech Dáire Barrach (Dáire Barrach macCathaír Már) Bresal Einechglas (Bressal Enechglass macCathaír Már) Fergus Luasgán Ailill Céthech Crimthann Eochu Timine Aengus Nic Cétach Fiacha Baiced (Fiachu Ba hAiccid macCathaír Már) Cathair Mor was the father of Landabria. She married Conn of a Hundred Battles, whose army had defeated and killed her father. [6] Research Notes This profile is based on Jaski's table 38, 44 Clann Name: Dál Niad Cuirp Annals The Annals of Ulster[7] AU - Starts at U 431 Geoffrey Keating Cathaoir Mor son of Feidhlimidh Fiorurghlas, son of Cormac Gealta Gaoth, son of Nia Corb, son of Cu Corb - hirty sons, good the progeny, Sprang from Cathaoir of Cuala; Thrice ten—a beauteous company, A troop of champions with stout spears. But twenty of these children went without issue, and the other ten had issue. Here are the names of the sons who had issue:—Rossa Failgheach senior of the sons who had issue, Daire Barrach, Breasal Einiochghlas, Fearghus, Oilill, Criomhthann, Deargmhosach, Eochaidh Teimhin, Aonghus, and Fiachaidh Aiceadha, the youngest of the children, although it was his descendants who mostly held the sovereignty of Leinster. From Fiachaidh Aiceadha son of Cathaoir Mor sprang O Broin and O Tuathail; from Breasal Bealach son of Fiachaidh Aiceadha sprang Mac Murchadha; from Rossa Failgheach son of Cathaoir Mor sprang O Conchubhair Failghe and O Diomasaigh and O Duinn and clan Colgan, as we shall afterwards state when we are giving the genealogy of the sons of Milidh. And this Cathaoir Mor fell by Conn Ceadchathach in the Battle of Magh hAgha.[8] Sources ↑ listed as monarch no: 109 and begining his reign in the year 119 AD by John O'Hart in his Roll of the Monarchs of Ireland Since the Milesian Conquest published in Irish pedigrees; or, The origin and stem of the Irish nation part ll page: 56 pub: J. Duffy and Co; Dublin 1892 ↑ The chronology of Geoffrey Keating's Foras Feasa ar Éirinn dates his reign to 113–116 ↑ the Annals of the Four Masters say 119–122 ↑ Wikipedia, (http:www.wikipedia.com: accessed 2 August 2015), "Cathair Mór," https://en.wikipedia.org/wiki/Cathair_M%C3%B3r. ↑ 5.0 5.1 Miles Dillon, editor, The Book of Rights (Dublin: Educational Company of Ireland, 1962), p. 148-169, digital images, https://archive.org/stream/lebornacertbooko00dilluoft#page/148/mode/2up. The Open Library (http://archive.org : accessed 19 August 2015). ↑ Roderic O'Flaherty, Ogygia: or, A chronological account of Irish events (Dublin: W. McKenzie, 1793), p. 210, digital images, https://books.google.com/books?id=OA0wAAAAMAAJ&pg=PA210. Google Books (http://books.google.com: accessed 2 August 2015. ↑ The Annals of Ulster - CELT ↑ The History of Ireland (Author: Geoffrey Keating) Section 40 pg.260,261 Wikipedia : Cathair Mór Wikidata: Item Q305487, en:Wikipedia help.gif Timna Chathaír Maír (The Testament of Cathair) Jaski, Bart Genealogical tables of medieval Irish royal dynasties Table-38, 44 Early Irish Kingship Succession by Jaski Bart, Published by Four Courts Press, 2013, ISBN 1846824265 ISBN 9781846824265 CGH - Corpus Genealogies iHiberniae Vol 1 ed. M.A. O'Brien (Dublin 1962) pg, 42-5, 50-7, 348, 356. Rawlinson B502 Dictionary of Irish Biography - cathair mar Bk Leinster, i, 92; vi, 1353–4, 1477 O'Brien, Corpus geneal. Hib., 44, 121, 124 Bk Rights, ed. Dillon, appendices A, B Keating, Forus feasa, i, 224–5, 244 Byrne, Ir. kings, 138–42 A. P. Smyth, ‘Huí Fáilgi relations with Huí Néill in the century after the loss of the plain of Mide’, Études Celt., xiv, no. 2 (1975), 516–17, 522 T. Ó Cathasaigh, The heroic biography of Cormac mac Airt (1977), 74–80 McCone, Pagan past, 120, 159; Bhreathnach, Tara bibliog., 53, 94, 102, 113; Ó hÓgáin, Myth, 76–7
  Person ID	I58523	Freeman-Smith
  Last Modified	27 Jan 2026

  
  

  Father	FIORURGHLAS Fedlemid (Fer) Feidhlimidh,   b. Abt 0050, Leinster, Ireland d. Abt 0122, Ireland (Age 72 years)
  Relationship	natural
  Family ID	F347170	Group Sheet  |  Family Chart

  
  

  Family
  Children	1. MÁR Landabaria,   b. Abt 0115, Leinster, Ireland d. Galway, Connaught, Ireland  [Father: natural]
  Family ID	F347169	Group Sheet  |  Family Chart
  Last Modified	27 Jan 2026