Crimthann Coscrach son of Fedlimid Fortrén, son of Fergus Fortamail

Fergus Fortamail

Fergus Fortamail , son of Bresal Brecc, son of Óengus Gailian, son of Ailill Bracan, son of Labraid Loingsech, was, according to medieval Irish legend and historical tradition, a 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 took power after killing his predecessor, Énna Aignech

Enna Aignech

Énna Aignech , son of Óengus Tuirmech Temrach, was, according to medieval Irish legend and historical tradition, a High King of Ireland. He took power after killing his predecessor, Nia Segamain, and ruled for twenty or twenty-eight years, after which he was killed by Crimthann Coscrach in the...

, and ruled for four or seven years, after which he was killed by Rudraige mac Sithrigi

Rudraige mac Sithrigi

Rudraige, son of Sitric, son of Dub, son of Fomor, son of Airgetmar, was, according to medieval Irish legend and historical tradition, a High King of Ireland. He took power after killing his predecessor, Crimthann Coscrach, and ruled for thirty or seventy years, after which he died of plague in...

. 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 VIII Physcon

Ptolemy VIII Physcon

Ptolemy VIII Euergetes II , nicknamed , Phúskōn, Physcon for his obesity, was a king of the Ptolemaic dynasty in Egypt. His complicated career started in 170 BC, when Antiochus IV Epiphanes invaded Egypt, captured his brother Ptolemy VI Philometor and let him continue as a puppet monarch...

 in Egypt (145-116 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 191-184 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 293-289 BC.