Siomón Brecc ("the speckled, spotted, ornamented"), son of Áedan Glas, son of Nuadu Finn Fáil, was, according to medieval Irish legend and historical tradition, a

High King of Ireland High King of Ireland ( ) 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 was later sometimes assigned anachronously or to leg ...

. He took power after killing the previous incumbent,

Sétna Innarraid Sétna Innarraid ("of wages, stipend, reward"), son of Bres Rí, was, according to medieval Irish legend and historical tradition, a High King of Ireland. He is said to have been the first Irish king to pay his soldiers. He ruled for twenty year ...

, who ruled for six years and was killed by Sétna's son Dui Finn. The ''

Lebor Gabála Érenn ''Lebor Gabála Érenn'' (literally "The Book of Ireland's Taking"; Modern Irish spelling: ''Leabhar Gabhála Éireann'', known in English as ''The Book of Invasions'') is a collection of poems and prose narratives in the Irish language inten ...

'' synchronises his reign with that of

Xerxes I Xerxes I ( – August 465 BC), commonly known as Xerxes the Great, was a List of monarchs of Persia, Persian ruler who served as the fourth King of Kings of the Achaemenid Empire, reigning from 486 BC until his assassination in 465 BC. He was ...

of the

Achaemenid Empire The Achaemenid Empire or Achaemenian Empire, also known as the Persian Empire or First Persian Empire (; , , ), was an Iranian peoples, Iranian empire founded by Cyrus the Great of the Achaemenid dynasty in 550 BC. Based in modern-day Iran, i ...

(485–465 BC). The chronology of

Geoffrey Keating Geoffrey Keating (; – ) was an Irish historian. He was born in County Tipperary, Ireland, and is buried in Tubrid Graveyard in the parish of Ballylooby-Duhill. He became a Catholic priest and a poet. Biography It was generally believed unt ...

's ''Foras Feasa ar Éirinn'' dates his reign to 685–679 BC, that of the ''

Annals of the Four Masters The ''Annals of the Kingdom of Ireland'' () or the ''Annals of the Four Masters'' () are chronicles of Middle Ages, medieval Irish history. The entries span from the Genesis flood narrative, Deluge, dated as 2,242 Anno Mundi, years after crea ...

'' to 910–904 BC.''

'
M4290-4296
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References

Legendary High Kings of Ireland {{Celt-myth-stub