Adomnán, the
Senchus fer n-Alban and the Irish annals record Áedán as a son of
Gabrán mac Domangairt (died c. 555–560). Áedán's brother Eoganán is known from Adomnán and his death is recorded c. 597. The
Senchus names three other sons of Gabrán, namely Cuildach, Domnall, and Domangart. Although nothing is known of Cuildach and Domangart or their descendants, Adomnán mentions a certain Ioan, son of Conall, son of Domnall, "who belonged to the royal lineage of the Cenél nGabráin", but this is generally read as meaning that Ioan was a kinsman of the Cenél nGabráin, and his grandfather named Domnall is not thought to be the same person as Áedán's brother Domnall. Áedán was about forty years old when he became king, following the death of his uncle
Conall mac Comgaill in 574. His succession as king may have been contested; Adomnán states that Columba had favoured the candidacy of Áedán's brother Eoganán. Adomnán claims that Áedán was ordained as king by Columba, the first example of an ordination known in Britain and Ireland. In 574, following the account of Conall's death, the
Annals of Ulster and the
Annals of Tigernach record a battle in
Kintyre, called the Battle of Teloch, or Delgu. The precise location of the battle is unidentified. The annals agree that "Dúnchad, son of Conall, son of Comgall, and many others of the allies of the sons of Gabrán, fell." In 575, the
Annals of Ulster report "the great convention of Druim Cett", at Mullagh or Daisy Hill near
Limavady, with Áed mac Ainmuirech and Columba in attendance. Adomnán reports that Áedán was present at the meeting. The purpose of the meeting is not entirely certain, but one agreement made there concerned the status of Áedán's kingdom. Áedán and Áed agreed that while the fleet of Dál Riata would serve the Uí Néill, no tribute would be paid to them, and warriors would only be provided from the Dál Riata lands in Ireland. The reason for this agreement is thought to have been the threat posed to Áedán, and also to Áed, by Báetán mac Cairill. Báetán is said to have forced the king of Dál Riata to pay homage to him at Rosnaree on
Islandmagee. Áedán is thought to be the king in question, and Ulster sources say that Báetán collected tribute from Scotland. Following Báetán's death in 581, the Ulstermen abandoned the Isle of Man, which they had captured in Báetán's time, perhaps driven out by Áedán who is recorded as fighting there c. 583. Earlier, c. 580, Áedán is said to have raided Orkney, which had been subject to
Bridei son of Maelchon,
King of the Picts, at an earlier date. Áedán's campaigns on the Isle of Man have sometimes been confused with the battle against the Miathi mentioned by Adomnán. The Miathi appear to have been the
Maeatae, a tribe in the area of the upper
river Forth. This campaign was successful, but Áedán's sons Artúr and Eochaid Find were killed in battle according to Adomnán. This battle may have taken place c. 590 and been recorded as the Battle of Leithreid or Leithrig. The
Prophecy of Berchán says of Áedán: "Thirteen years (one after another) [he will fight against] the Pictish host (fair the diadem)." The only recorded battle between Áedán and the Picts appears to have been fought in Circinn, in 599 or after, where Áedán was defeated. The annals mention the deaths of his sons here. It has been suggested that this battle was confused with the "Battle of Asreth" in Circinn, fought c. 584, in which Bridei son of Maelchon was killed. This battle is described as being "fought between the Picts themselves". A number of Welsh traditions point to warfare between Áedán and King
Rhydderch Hael of
Alt Clut, the northern Brittonic kingdom later known as Strathclyde.
Hector Munro Chadwick and subsequent historians suggest Áedán was initially in a long-term alliance with Rhydderch and his predecessors, but that it eventually collapsed into conflict. The lost Irish epic
Orgain Sratha Cluada is usually thought to refer to the attack on Alt Clut in 870 by
Vikings, but MacQuarrie suggests that it may refer to an attack by Áedán on Rhydderch. ==Degsastan and after==