According to medieval Irish legend and historical tradition, Eochaid was a High King of Ireland, best known as the father of Niall of the Nine Hostages and ancestor of the Uí Néill and Connachta dynasties.
According to the Lebor Gabála Érenn[1] and its derivative works, Eochaid was the son of the former High King Muiredach Tírech, a descendant of Conn Cétchathach.
Mongfind is said to have hated Cairenn, and forced her to expose her child, but the baby was rescued and raised by a poet called Torna.
[4] Although it is probably anachronistic for Eochaid to have had a Saxon wife, T. F. O'Rahilly argues that the name Cairenn is derived from the Latin name Carina, and that it is plausible that she might have been a Romano-Briton.
[6] After ruling for seven or eight years, Eochaid died of an illness at Tara, and was succeeded by Mongfind's brother Crimthann mac Fidaig, king of Munster.