'''Áed mac Diarmato''' (died 604), called '''Áed Sláine''' (Áed of Slane) was the son of Diarmait mac Cerbaill. Legendary stories exist of Áed's birth. Saint Columba is said to have prophesied his death. His descendants, the Síl nÁedo Sláine&mdash;the seed of Áed of Slane&mdash;were prominent in 7th and early 8th century Ireland.

==Origins==

Áed's mother is said to have been Mugain Mór, perhaps an euhemerisation of a Munster sovereignty goddess. This Mugain is called the daughter of Conchrad mac Duach, the king of Osraige. Mugain and Diarmait's marriage is barren, and Mugain is humiliated by Diarmait's chief wife until she is given blessed holy water to drink by Saint Finnian of Moville, after which she gives birth to a lamb, then to a salmon, and finally to Áed. 

Finnian prophesied that Áed would "surpass his brethren and more kings will come from him than from the sons of others". This prophecy may perhaps be dated to the period before 750, when the Síl nÁedo Sláine were dominant, after which the descendants of Áed's brother Colmán Már&mdash;Clann Cholmáin&mdash;were clearly the most important group descended from Diarmait mac Cerbaill. A third brother of Áed, Colmán Bec, was also an  ancestor figure, but of the less important Caílle Follamain. The many legends surrounding his father name other brothers of Áed, but their historical existence is uncertain.

Áed and his kin were considered by later genealogies and histories to be members of the southern branch of the Uí Néill kindred, but this may be a later addition to include the descendants of Diarmait mac Cerbaill, supposed to be great-grandson of Niall of the Nine Hostages, among the ranks of the dominant Uí Néill. The other branches of the Uí Néill, the great Cenél Conaill and the Cenél nEógain, and the lesser Cenél Lóegairi, Cenél Maine, Cenél nÉndai, Cenél Coirpri and Cenél Fiachach, traced their ancestry rather to sons of Niall.

==Life==
Compared to his father and his sons, relatively little is said of Áed, either in the Irish annals or in other sources such as hagiography or heroic verse.

Adomnán recounts Columba's prophecy to Áed in his ''Life of St Columba''. Columba told Áed that he would be as great a king as his father&mdash;Adomnán calls Diarmait king of Ireland&mdash;only if he avoided kinslaying. If he killed a kinsman he would be king only of his own people and that for only a short time.

'''Áed  Sláine mac Diarmato '''   Ard ri Érenn conjoint de 598 à 604. 

Áed  Sláine était le fils de  Uí Neill du Sud. Son surnom  est à rapprocher du site ecclésiastique de Slane (Comté de Meath). Le début de son règne conjoint avec Colmán Rímid mac Báetán membre du Cenél nÉogain est enregistré en 598<ref>Annales d'Ulster U598.4</Ref>.

Le seul événement retenu par les analystes est le meurtre en Uí Neil  qui régnait sur Mide.

En Tara". Colmán Rímid fut tué par un membre de son propre clan et d’Áed  Sláine, par Conall mac Suibne son petit-neveu.

Selon Adamnan, Saint Colomba fondateur d'Iona aurait prophétisé qu'Áed Sláine du fait du péché commis lors du meurtre de  son parent Suibne ne régnerait pas comme son père sur la totalité de l'Irlande et que son règne serait abrégé <ref>Adamnan Vie de St Colomba Chapitre 8</ref>.   

L’importance d’ Brega jusqu'au XIIe siècle et s’opposa aux descendants de Colmán Mór, le  Clann Cholmáin.

Síl nÁedo Sláine fournit cinq Ard ri Érenn avant d’être écarté par son rival en 728. Seul Conghalach Cnogba mort en 956 put recouvrer au Xe siècle le titre d’Ard ri Érenn.   

* Diarmait Ruanaid et Blathmac mac Áedo co Ard ri Érenn morts en 665
* Fínnachta Fledach   mort en 695
* Fógartach mac Neill mort en 724
* Cinaed mac Irgalaig mort en 728

Áed  Sláine  épousa successivement 