Fiachrae was an Irish prince, the son of the high king Eochaid Mugmedón (d.362) by his wife Mongfind, sister of Crimthann mac Fidaig (d.367).Francis J.Byrne, ''Irish Kings and High-Kings'', Table 1 He was ancestor of the Uí Fiachrach dynasties of

Connacht Connacht or Connaught ( ; or ), is the smallest of the four provinces of Ireland, situated in the west of Ireland. Until the ninth century it consisted of several independent major Gaelic kingdoms (Uí Fiachrach, Uí Briúin, Uí Maine, C ...

. He lived in the late 4th century. "The Violent Death of Crimthann mac Fidaig and of the Three Sons of Eochaid Muigmedón" gives the story of the sons of Eochaid Mugmedón. According to this saga, his half-brother the high king Niall Noigiallach (d.405) made Fiachrae's full brother Brión his champion and Brion seized the kingship of Connacht. This led to war between Brion and Fiachrae and they fought a battle at Damchluain (near

Tuam Tuam (; , meaning 'mound' or 'burial-place') is a town in Ireland and the second-largest settlement in County Galway. It is west of the midland Region, Ireland, midlands of Ireland, about north of Galway city. The town is in a civil parishe ...

County Galway County Galway ( ; ) is a Counties of Ireland, county in Republic of Ireland, Ireland. It is in the Northern and Western Region, taking up the south of the Provinces of Ireland, province of Connacht. The county population was 276,451 at the 20 ...

). Fiachrae was captured and taken to Tara. However Fiachrae's son Nath Í rallied forces and defeated and slew Brion at a second battle at Damchluain. Fiachrae was now released by Niall and given Brion's position as champion and levier of his hostages and rents. With his brother Ailill, he then went to take hostages from Munster. They defeated Eochaid mac Crimthainn and took loot and hostages. However, Fiachrae was severely wounded and died at Ferrach in Meath on the way home. The hostages of Munster were buried alive with him as a tribute to him.

Notes

References

* Francis J.Byrne, ''Irish Kings and High-Kings'' * ''The Chronology of the Irish Annals'', Daniel P. McCarthy
Dan Wiley's site on the Cycles of the Kings
Nobility from County Roscommon Monarchs from County Mayo 5th-century Irish people {{Ireland-royal-stub