He was the son of the high king Flaithbertach mac Loingsig (died 765).
His father Flaithbertach was the last Cenél Conaill high king of Ireland.
He was deposed or abdicated in 734 in favor of the rival northern Ui Neill family, the Cenél nEógain, led by Áed Allán (died 743).
[2] Áed Allán was defeated and slain in the battle at Seredmag by Domnall Midi (died 763) of the Clann Cholmáin branch of the southern Ui Neill in 743.
His son Domnall mac Áeda Muindeirg (died 804) was also called King of the North in the annals.