Eochaid Gonnat or Gunnat ("wounding"?), son of Fiach, son of Imchad, son of Bresal, son of Sírchad, son of Fíatach Finn

Fiatach Finn

Fiatach Finn mac Dáire, a distant descedant of Óengus Tuirmech Temrach, was, according to medieval Irish legend and historical tradition, a king of the Ulaid, later a High King of Ireland, and the eponymous ancestor of the early Medieval Ulster dynasty of the Dál Fiatach...

, was, according to medieval Irish legend and historical tradition, a High King of Ireland

High King of Ireland

The High Kings of Ireland were sometimes historical and sometimes legendary figures who had, or who are claimed to have had, lordship over the whole of Ireland. Medieval and early modern Irish literature portrays an almost unbroken sequence of High Kings, ruling from Tara over a hierarchy of...

. He came to the throne on the death of Cormac mac Airt

Cormac mac Airt

Cormac mac Airt , also known as Cormac ua Cuinn or Cormac Ulfada , was, according to medieval Irish legend and historical tradition, a High King of Ireland...

. He ruled for a year, before falling in battle. Sources differ as to his killer: he was either Lugaid mac Lugna, Lugaid Menn son of Óengus, or Lugna Feirtre. He was succeeded by Cormac's son Cairbre Lifechair

Cairbre Lifechair

Cairbre Lifechair , son of Cormac mac Airt, was, according to medieval Irish legend and historical tradition, a High King of Ireland. He came to the throne after the death of Eochaid Gonnat...

. The chronology of Geoffrey Keating

Geoffrey Keating

Seathrún Céitinn, known in English as Geoffrey Keating, was a 17th century Irish Roman Catholic priest, poet and historian. He was born in County Tipperary c. 1569, and died c. 1644...

's Foras Feasa ar Éirinn dates his reign to 244-245, the Annals of the Four Masters

Annals of the Four Masters

The Annals of the Kingdom of Ireland or the Annals of the Four Masters are a chronicle of medieval Irish history...

to 266-267.