== Bunús tíreolaíoch ==
Cé go gcreideann Francis Byrne agus John O'Donovan gurbh as ''Mag nAí'' an chlann ó dhúchas, luann Roderic O'Flaherty agus John Colgan na scéalta inste faoi Naoimh Pádraig<ref>Roderic O'Flaherty, ''Ogygia'', iml. II, cuid III, lch. 293.</ref> agus Felartus,<ref>John Colgan, ''Acta Sanctorum Hiberniae'', lch. 788.</ref> agus iad ag tabhairt cuairte ar mhic Briúin ar Mhaigh Seola. De bharr an mhearbhaill a bhaineann le suíomh an 'Mag Selce' luaite sa [[Vita
tripartite Sancti Patricii]], mholl Nicholls gur bogadh ar chúiseanna polaitiúla áit dúchais Uí Bhriúin chuig gar de Ráth Cruachan faoin am [[Tíreachán|Tíreacháin]].<ref>K. W. Nicholls, "Some Patrician Sites of Eastern Connacht", ''Dinnseanchas'' 5:4 (1973), lch. 118.</ref> Tugann MacCotter le fios nach mbeadh ar fáil ag muintir Uí Bhriúin ar ''Mag nAí'' agus iad ag teacht chun cinn ach cúpla paróiste sibhialta.<ref>Paul MacCotter, ''Medieval Ireland: Territorial, Political and Economic Divisions'', lch. 209.</ref>
Sa scéal ''[[Aided Chrimthaind maic Fhidaig ocus Trí mac Echach Muigmedóin]]'',
insítear go raibh '' during the legendary war between Brión and Fiachra, Fiachra's encampment was situated in Aidhne and Brión 's lay in Damh-Chluain, which is stated to be in Uí Bhriúin Seóla and not far ó [[Cnoc Meá|Chnoc Meá]], taobh thiar de [[Tuaim|Thuaim]].<ref>John O'Donovan, ''The Genealogies, Tribes and Customs of Hy-Fiachrach'', Addendum A, lch. 344.</ref> Although this is a legend, it may be an indication of the Uí Briúin's original homeland, as is Aidhne for the Uí Fiachrach. In addition, Hubert Knox, citing the [[Conmaicne]]'s distribution and early status as subjects of the Uí Briúin, posited that the Uí Briúin originated in the barony of Clare in County Galway as the leading lineage of that people.<ref>Hubert Thomas Knox, ''The History of the County of Mayo to the Close of the Sixteenth Century'', ll. 19-20.</ref> Intriguingly, the [[Leabhar Bhaile an Mhóta]] calls [[Cellach mac Rogallaig|Ceallach mac Raghallaigh]] "King of Conmaicne",<ref>[[Leabhar Bhaile an Mhóta]], ARÉ MS 23 P 12, f. 37r.</ref> a title also commonly taken by members of the Uí Bhriúin Bhréifne branch in later centuries . The Maigh Seola origin scenario is more consistent with the fact that early Uí Bhriúin kings (e.g. [[Cenn Fáelad mac Colgan|Ceann Faoladh mac Colgan]] agus Ceallach mac Raghallaigh) had their residence on [[Loch Cime]], as well as [[Áed mac Echach|Aodh mac Eachach]] donation of [[Eanach Dhúin]] sa 6ú haois,<ref>[[Annála Inis Faithlinn]], AIF 578.2.</ref> which Byrne thought unlikely given Annaghdown's distance from Mag nAí.<ref>Byrne, Francis J., ''Irish Kings and High-Kings'', p. 245.</ref> Furthermore, Ceann Faoladh is stated in the annals as having been killed by the Conmaicne Cuile,<ref>[[Annála Tiarnaigh]], AT 682.1</ref> and the king-list in [[Sioncronachtaí Laud]] states that the same king died at the hands of "his own people".<ref>"''A dáine fén romarb''", [[Sioncronachtaí Laud]] , lch. 116r</ref> If both of these accounts are accurate, it would indicate that the Uí Bhriúin originated among the Conmaicne.
''With the inclusion of Máenach mac Báethíne,<ref>ACM 649.3.</ref> ancestors of all three major branches of the dynasty are mentioned in the annals as residing or fighting in the Maigh Seola region in the 7ú haois. The district to the east of [[Loch Coirib]] is referred to as "Magh Ua mBriuin" at least as late as 1149.<ref>ACM 1149.13.</ref> This likely denotes the domain of the "rí Uí Bhriúin", a title borne primarily by men of the Uí Bhriúin Seóola.<ref>Anne Connon, "Uí Briúin" in ''Medieval Ireland: An Encyclopedia'', lch. 486.</ref> As Knox points out, these kings were distinguished at an early date from the Síol Muireadhaigh of central Ros Comáin in the [[Leabhar na gCeart]], suggesting that the lands of the Uí Bhriúin Seola were the original Uí Bhriúin.<ref>Hubert Thomas Knox, ''The History of the County of Mayo to the Close of the Sixteenth Century'', lch. 20.</ref>