Fíachu Labhrainne, son of Smirgoll, son of Enboth, son of Tigernmas

Tigernmas

Tigernmas, son of Follach, son of Ethriel, a descendant of Érimón, was, according to medieval Irish legend and historical traditions, an early High King of Ireland...

, was, according to medieval Irish legend and historical tradition, a High King of Ireland

High King of Ireland

The High Kings of Ireland were sometimes historical and sometimes legendary figures who had, or who are claimed to have had, lordship over the whole of Ireland. Medieval and early modern Irish literature portrays an almost unbroken sequence of High Kings, ruling from Tara over a hierarchy of...

. He came to power by killing the previous incumbent, Eochaid Faebar Glas

Eochaid Faebar Glas

Eochaid Faebar Glas, son of Conmáel, was, according to medieval Irish legend and historical tradition, a High King of Ireland. His epithet means "blue-green sharp edge"...

, in the battle of Carman, in vengeance for his father, who had been killed by Eochaid in the battle of Druimm Liatháin. He was named after the river Labrainn, which burst from the ground during his reign. He fought a sea battle against the descendants of Éber Finn

Eber Finn

Éber Finn , son of Míl Espáine, was, according to medieval Irish legend and historical tradition, a High King of Ireland and one of the founders of the Milesian lineage, to which medieval genealogists traced all the important Gaelic royal lines.According to the Lebor Gabála Érenn, the ancestors of...

, and fought a battle against the Érainn at Mag Genainn in County Fermanagh

County Fermanagh

Fermanagh District Council is the only one of the 26 district councils in Northern Ireland that contains all of the county it is named after. The district council also contains a small section of County Tyrone in the Dromore and Kilskeery road areas....

, which resulted in Loch Erne bursting from the ground. In another battle he killed Eochaid's son Mofebis. Mofebis's son Eochu Mumu killed him in vengeance in the battle of Sliab Belgatain. Geoffrey Keating

Geoffrey Keating

Seathrún Céitinn, known in English as Geoffrey Keating, was a 17th century Irish Roman Catholic priest, poet and historian. He was born in County Tipperary c. 1569, and died c. 1644...

 adds that during his reign, his son Aengus Olmucada

Aengus Olmucada

Óengus Olmucaid , son of Fíachu Labrainne, was, according to medieval Irish legend and historical tradition, a High King of Ireland. During the reign of his father, he conquered Scotland. He came to power by killing the incumbent High King, Eochu Mumu, who had killed his father twenty-one years...

 conquered Scotland

Scotland

Scotland is a country that is part of the United Kingdom. Occupying the northern third of the island of Great Britain, it shares a border with England to the south and is bounded by the North Sea to the east, the Atlantic Ocean to the north and west, and the North Channel and Irish Sea to the...

. The Lebor Gabála Érenn

Lebor Gabála Érenn

Lebor Gabála Érenn is the Middle Irish title of a loose collection of poems and prose narratives recounting the mythical origins and history of the Irish from the creation of the world down to the Middle Ages...

synchronises his reign with those of Piritiades and Ofratalus in Assyria

Assyria

Assyria was a Semitic Akkadian kingdom, extant as a nation state from the mid–23rd century BC to 608 BC centred on the Upper Tigris river, in northern Mesopotamia , that came to rule regional empires a number of times through history. It was named for its original capital, the ancient city of Assur...

. The chronology of Keating's Foras Feasa ar Éirinn dates his reign to 1095-1071 BC, that of the Annals of the Four Masters

Annals of the Four Masters

The Annals of the Kingdom of Ireland or the Annals of the Four Masters are a chronicle of medieval Irish history...

to 1473-1449 BC.