[1] Domnall's brother Máel Cobo (died 615) is said to have been High King of Ireland, and his father Áed also, but both claims are later inventions based on the Annals of the Four Masters and similar writings.
The list of High Kings found in the Baile Chuinn Cétchathaigh (The Frenzy of Conn of the Hundred Battles), which is dated to before 695, includes Domnall.
The original writer of the Annals of Ulster named just twelve "kings of Ireland", starting with Domnall in 628–642, and ending with Ruaidrí Ua Conchobair in 1166–1186.
At Fid Eóin, Máel Caích mac Sgannail defeated the army of the Dál Riata, clients of the Cenél Conaill.
The Ulaid were not the main sufferers, however, as the Dál Riata are thought to have lost their lands in County Antrim as a result of the battle.
Mag Rath was attached to the Buile Shuibhne, the tale of a fictitious Dál nAraidi king named Suibhne Gelt, which is probably much older in origin.