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The Uí Fiachrach Muaidhe were a branch of the Uí Fiachrach dynasty of the Connachta. They were centred on the Moy River valley of County Mayo. At its largest extent, their territory, Tír Fhíachrach Múaidhe (now in County Sligo) included the territories of Irrus Domnann and Tír Amhalgaidh now in Co. Mayo.[1] This branch of the Ui Fiachrach was descended from Fiachnae, a brother of Ailill Molt (died 484), high king of Ireland.[2] Later their chief sept was the Ó Dubhda (O'Dowd), princes at Carn Amalgaidh, near Killala, Co. Mayo.[1]

They provided some Kings of Connacht, including:[3]


  1. ^ a b Ireland's history in Maps
  2. ^ Francis J.Byrne, Irish Kings and High-Kings, Table 18
  3. ^ Byrne, Table 18 with dates per The Chronology of the Irish Annals, Daniel P. McCarthy

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