Worker: Cathair Mór, son of Feidhlimidh Fiorurghlas, a descendant of Conchobar Abradruad, was, according to Lebor Gabála Érenn, a High King of Ireland, he ruled for three years, at the end of which he was killed by the Luaigne of which location, near the River Boyne, is an archaeological complex that runs between Navan and Dunshaughlin in County Meath, Ireland?