Aillil mac Dúngaile Eilni (died 690) was a Dál nAraidi king of the Cruthin in Ulaid, an over-kingdom in medieval Ireland. He was the son of Dúngal Eilni mac Scandail (died 681), a previous king.[1] He ruled from 682-690.
In the 6th and 7th centuries the Dál nAraidi were part of a confederation of Cruthin tribes in Ulaid and were the dominant dynasty. Ailill belonged to a branch of this family settled in Eilne, a plain between the Bann and Bush rivers in modern-day County Antrim, Northern Ireland. He is styled "King of the Cruithne" in the Fragmentary Annals' of Ireland.[2] The annals record that Ailill was killed but the circumstances are not mentioned.[3]
His brother Cú Chuarán mac Dúngail Eilni (died 708) was also king of Dál nAraidi as well as of Ulaid as was his son Cathussach mac Ailello (died 749).