Siomón Brecc ("the speckled, spotted, ornamented"),Dictionary of the Irish Language, Compact Edition, Royal Irish Academy, 1990, p. 82 son of Áedan Glas, son of Nuadu Finn Fáil, was, according to medieval Irish legend and historical tradition, a High King of Ireland. He took power after killing the previous incumbent, Sétna Innarraid, who ruled for six years and was killed by Sétna's son Dui Finn. The Lebor Gabála Érenn synchronises his reign with that of Xerxes I of the Achaemenid Empire (485–465 BC).R. A. Stewart Macalister (ed. & trans.), Lebor Gabála Érenn: The Book of the Taking of Ireland Part V, Irish Texts Society, 1956, p. 253 The chronology of Geoffrey Keating's Foras Feasa ar Éirinn dates his reign to 685–679 BC,Geoffrey Keating, Foras Feasa ar Éirinn 1.26 that of the Annals of the Four Masters to 910–904 BC.Annals of the Four Masters M4290-4296
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