About Giallchaidh mac Olioll, Ard Rí na h'Éireann
Gialchadh King of Ireland
1013 BC, Battle of Magh Muadh
Ailill (Olioll) Oalchláen
was the 37th Monarch; killed by Art Imleach, of the Line of Heber Fionn, at Moighe Muadh, B.C. 1013.
Part III, Chapter IV of Irish Pedigrees, by John O'Hart, published 1892, pages 351-9, 664-8 and 708-9.
-------------------- Giallchad, son of Ailill Olcháin, son of Sírna Sáeglach, was, according to medieval Irish legend and historical tradition, a High King of Ireland. He took power after killing his predecessor, and the son of his grandfather's killer, Elim Olfínechta, in the battle of Comair Trí nUisce. He is said to have taken one out of every five men of Munster hostage. He reigned for nine years, before being killed by Elim's son Art Imlech at Mag Muaide. The Lebor Gabála Érenn synchronises his reign with that of Phraortes of the Medes (665-633 BC). The chronology of Geoffrey Keating's Foras Feasa ar Éirinn dates his reign to 786-777 BC, that of the Annals of the Four Masters to 1023-1014 BC.
He became the thirty-seventh monarch of Ireland ca. 1022 BC and reigned for nine years.