Siomón Brecc ("the speckled, spotted, ornamented"),[1] 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).
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