Lugaid Íardonn, son of Énna Derg, was, according to medieval Irish legend and historical tradition, a

High King of Ireland High King of Ireland ( ga, Ardrí na hÉireann ) was a royal title in Gaelic Ireland held by those who had, or who are claimed to have had, lordship over all of Ireland. The title was held by historical kings and later sometimes assigned ana ...

. His epithet,

Old Irish Old Irish, also called Old Gaelic ( sga, Goídelc, Ogham script: ᚌᚑᚔᚇᚓᚂᚉ; ga, Sean-Ghaeilge; gd, Seann-Ghàidhlig; gv, Shenn Yernish or ), is the oldest form of the Goidelic/Gaelic language for which there are extensive writt ...

for "dark brown", came from the colour of his hair. He succeeded his father, who had died of plague, to the throne, and ruled for nine years before he was killed at Ráth Clochair by Sírlám, son of

Finn mac Blatha Finn, son of Blath, son of Labraid Condelg, son of Cairpre, son of Ollom Fotla, was, according to medieval Irish legend and historical tradition, a High King of Ireland. He took power after he killed the previous High King, Eochu Apthach, whose di ...

. The ''

Lebor Gabála Érenn ''Lebor Gabála Érenn'' (literally "The Book of the Taking of Ireland"), known in English as ''The Book of Invasions'', is a collection of poems and prose narratives in the Irish language intended to be a history of Ireland and the Irish fro ...

'' synchronises his reign with that of

Artaxerxes I of Persia Artaxerxes I (, peo, 𐎠𐎼𐎫𐎧𐏁𐏂𐎠 ; grc-gre, Ἀρταξέρξης) was the fifth King of Kings of the Achaemenid Empire, from 465 to December 424 BC. He was the third son of Xerxes I. He may have been the " Artas ...

(465–424 BC). The chronology of

Geoffrey Keating Geoffrey Keating ( ga, Seathrún Céitinn; c. 1569 – c. 1644) was a 17th-century historian. He was born in County Tipperary, Ireland, and is buried in Tubrid Graveyard in the parish of Ballylooby-Duhill. He became an Irish Catholic priest and a ...

's ''Foras Feasa ar Éirinn'' dates his reign to 658–649 BC, that of the ''

Annals of the Four Masters The ''Annals of the Kingdom of Ireland'' ( ga, Annála Ríoghachta Éireann) or the ''Annals of the Four Masters'' (''Annála na gCeithre Máistrí'') are chronicles of medieval Irish history. The entries span from the Deluge, dated as 2,24 ...

'' to 881–872 BC.''

'
M4320-4328
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References

Legendary High Kings of Ireland {{Ireland-royal-stub