Áed Sláine

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 Sláinethe seed of Áed of Slanewere prominent in 7th and early 8th century Ireland.


Main article: Diarmait mac Cerbaill

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 date to the period before 750, when the Síl nÁedo Sláine were dominant, after which the descendants of Áed's brother Colmán MárClann Cholmáinwere 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.


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 fatherAdomnán calls Diarmait king of Irelandonly 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.

According to some later king lists, Áed was jointly High King of Ireland with Colmán Rímid of the Cenél nEógain after the death of Áed mac Ainmuirech in 598. Áed mac Ainmuirech died in battle near Baltinglass, modern County Wicklow, fighting against Brandub mac Echach, King of Leinster.

It was to distinguish him from that Áed and from others that Áed mac Diarmato received his cognomen, "Áed of Slane", referring to the Hill of Slane, a prehistoric site near the Hill of Tara, which lay within his lands. Some sources omit Áed from the list of kings, including the earliest, that found in the Baile Chuind Chétchathaig, a work of dynastic propaganda compiled in the reign of Áed's grandson Fínsnechta Fledach. His omission from this is believed to be a transcription error, and it very likely that he was High King.

In 600 Áed had his nephew, Suibne mac Colmáin Már, killed, "treacherously" says Adomnán. According to Marianus Scotus, Suibne, rather than Áed and Colmán Rímid, had been High King. In 604 both Áed and Colmán Rímid died by violence. Colmán was murdered by a kinsman and Suibne's son Conall Guthbinn killed Áed. This may have happened in battle and Áed may have been allied with the Uí Failgi, neighbours of Conall's. Áed and Colmán Rímid were followed as High King by Áed Uaridnach.

Áed's recorded children are at least six sons, including Diarmait and Blathmac, and a daughter named Rontud. Áed's grandchildren included Fínsnechta Fledach, Sechnassach and Cenn Fáelad. His wife's name is recorded as Eithne.


  • Byrne, Francis John (1973), Irish Kings and High-Kings, London: Batsford, ISBN 0-7134-5882-8 
  • Charles-Edwards, T. M. (2000), Early Christian Ireland, Cambridge: Cambridge University Press, ISBN 0-521-36395-0 
  • Irwin, Philip (2004), "Áed Sláine mac Diarmata (d. 604)", Oxford Dictionary of National Biography, Oxford: Oxford University Press, retrieved 2007-10-25 
  • MacKillop, James (1998), The Oxford Dictionary of Celtic Mythology, Oxford: Oxford University Press, ISBN 0-19-860967-1 
  • Sharpe, Richard (1995), Adomnán of Iona: Life of St Columba, Harmondsworth: Penguin, ISBN 0-14-044462-9 
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