Lugaid Lámderg son of Eochaid Uaircheas

Eochaid Uaircheas

Eochu Uairches, son of Lugaid Íardonn, was, according to medieval Irish legend and historical tradition, a High King of Ireland. After Lugaid was overthrown and killed by Sírlám, Eochu was driven into exile overseas, but he returned after twelve years, killed Sírlám with an arrow, and took the...

, 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...

. 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...

says he reigned jointly with Conaing Bececlach, ruling the southern half of the island while Conaing ruled the north, after he killed the previous southern ruler, Conaing's brother Eochu Fíadmuine, while 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...

 and 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...

 say he deposed Conaing when he killed Eochu and ruled the whole island. He ruled for seven years, after which Conaing killed him and became High King of the whole island. The Lebor Gabála synchronises Lugaid's reign with those of Artaxerxes I

Artaxerxes I of Persia

Artaxerxes I was the sixth king of kings of the Achaemenid Empire from 465 BCE to 424 BCE. He was the son of Xerxes I of Persia and Amestris, daughter of Otanes.*Artaxerxes I was the sixth king of kings of the Achaemenid Empire from 465 BCE to 424 BCE. He was the son of Xerxes I of Persia and...

 (465-424 BC) and Darius II

Darius II of Persia

Darius II , was king of the Persian Empire from 423 BC to 405 BC.Artaxerxes I, who died on December 25, 424 BC, was followed by his son Xerxes II. After a month and a half Xerxes II was murdered by his brother Secydianus or Sogdianus...

 (423-404) of Persia. The chronology of Keating's Foras Feasa ar Éirinn dates his career to 616-609 BC, that of the Annals of the Four Masters to 839-832 BC.