Áed Allán was the son of Fergal mac Máele Dúin and a member of the Cenél nEógain, a branch of the Northern Uí Néill.
However, the clerics of Armagh may have been well satisfied as the Annals of Ulster, in the entry following that which reports the meeting of Áed Allán and Cathal, say that the law of Patrick was in force in Ireland.
Bran Bec of the Uí Dúnlainge, the son of that Murchad mac Brain Mut who had defeated Áed Allán's father in 722, was also killed.
The Annals of Ulster say:And men say that so many fell in this great battle that we find no comparable slaughter in a single onslaught and fierce conflict throughout all preceding ages.
Flaithbertach's son Áed Muinderg is called rí in Tuaisceart—King of the North, a title apparently meaning that he was acknowledged as chief ruler among the northern Uí Néill and perhaps as Domnall Midi's deputy—at his death in 764.