Áed mac Néill (Old Irish pronunciation: [ˈaːi̯ð mak ˈnʲeːl̠ʲ]; died 819), commonly called Áed Oirdnide ("the anointed"), was King of Ailech. A member of the Cenél nEógain dynasty of the northern Uí Néill, he was the son of Niall Frossach. Like his father, Áed was reckoned High King of Ireland. He was King of Ailech from 788 onwards and High King of Ireland from 797.
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King of Ailech
The conflict between Cenél nEógain and Cenél Conaill for the leading role in the north appears to have turned on control over the lands of the minor Cenél nEndai branch of the Uí Néill which lay around Raphoe. Communications between the northern and southern branches of Cenél Conaill, respectively based on the north-west coast of Donergal and in the south around Donegal town, ran through these. While Cenél nEndai were clients or allies of Cenél Conaill, as they had been before Áed Allán defeated Flaithbertach mac Loingsig in the 730s, Cenél Conaill had the upper hand, and provided kings of Tara and kings of the North. By the death of Niall Frossach, if not earlier, Cenél nEndai were again under the sway of Cenél Conaill.
The region was still disputed in 787 when Máel Dúin defeated Domnall and appears to have gained some recognition as king of the North as he is so styled at his death the following year. Áed succeeded Máel Dúin as king of Ailech, but was challenged by Domnall whom he defeated at the battle of Clóitech (modern Clady, County Tyrone) in 789. This appears to have been the final attempt by kings of Cenél Conaill to regain control of the lands around Raphoe which had been seized by Cenél nEógain.