Fiacha Labhrainne was a legendary High King of Ireland. During his reign, about 250 years after the arrival of the Milesians in Ireland, he and his son Aengus Olmucada are said to have subdued Britain. The office of High King of Ireland (Irish: Ard Rí Érenn) was in origin a pseudohistorial construct of the eighth century that placed a king of all Ireland atop the fragmented pyramid of kingship that actually existed at that time. ... In Irish mythology the Milesians or Sons of Míl Espáine were the final inhabitants of Ireland, representing the Goidelic Celts. ... Aengus Olmucada, son of Fiacha Labhrainne, was a legendary High King of Ireland. ...
Eochaid Faebar Glas, son of Conmael, was a legendary High King of Ireland. ... The High Kingship of Ireland was a pseudohistorical construct of the eighth century AD, a projection into the distant past of a political entity that did not become reality until the ninth century. ... Signature page from the Annals of the Four Masters Entry for A.D. 432 The Annals of the Four Masters or the Annals of the Kingdom of Ireland by the Four Masters are a chronicle of medieval Irish history. ... Seathrún Céitinn, known in English as Geoffrey Keating, was a 17th century Irish clergyman, poet and historian. ... Eochaid Mumho was a legendary High King of Ireland. ...
Fiacha at length (B.C. 1448) fell in the battle of Bealgadain, by the hands of Eochaidh Mumho, the son of Moefeibhis, of the race of Heber Fionn.
This Fiacha was married to Eithne, daughter of the King of Alba; whither, being near her confinement at the death of her husband, she went, and was there delivered of a son, who was named Tuathal.
From Eochaidh Fionn-Fohart decended O'Nowlan or Nolan of Fowerty (or Foharta), in Lease (or Leix), and Saint Bridget; and from Fiacha Suidhe are O'Dolan, O'Brick of Dunbrick, and O'Faelan of Dun Faelan, near Cashel.
Fiacha slew Fiatach Finn to become king and reigned for twenty years.
1473 BC in revenge for his father (the Annals of the Four Masters states that the lineage is Fiacha, son of Caermna, son of Ebric, son of Ir, son of Miledh).
Fiacha aquired the name Labhrainne from one of the rivers which sprung forth during his reign.