About Giallchaidh mac Olioll, 37th High King of Ireland
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.