Fergus Fortamail son of Bresal Brecc, son of Óengus Gailian, son of Ailill Bracan, son of Labraid Loingsech

Labraid Loingsech

Labraid Loingsech , also known as Labraid Lorc, son of Ailill Áine, son of Lóegaire Lorc, was, according to medieval Irish legend and historical tradition, a High King of Ireland. He was considered the ancestor of the Laigin, who gave their name to the province of Leinster...

, 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 took power after killing the previous incumbent, Eochaid Ailtlethan, in battle, and ruled for either eleven, twelve or twelve and a half years, until he was killed by Eochaid's son Óengus Tuirmech Temrach in battle at Tara

Hill of Tara

The Hill of Tara , located near the River Boyne, is an archaeological complex that runs between Navan and Dunshaughlin in County Meath, Leinster, Ireland...

. 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 that of Ptolemy VI Philometor

Ptolemy VI Philometor

Ptolemy VI Philometor was a king of Egypt from the Ptolemaic period. He reigned from 180 to 145 BC....

 in Egypt (180-145 BC). The chronology of 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...

's Foras Feasa ar Éirinn dates his reign to 274-262 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 396-385 BC.