While Irish history in this period is replete with the names of persons, about whom little is usually known save for their ancestry and the date and manner of their death, no early source preserves Congal's ancestry. According to later materials Congal was the son of Scandal Sciathlethan and grandson of Fiachnae mac Báetáin. In the 6th and 7th centuries the Dal nAraide were part of a confederation of Cruithne tribes in Ulaid and were the dominant members. The main ruling line of the Dal nARaide was known as the Uí Chóelbad based in Mag Line, east of Antrim town in modern county Antrim. It is possible that Congal did not belong to this branch of the Cruithne but some other rival branch and so would not be the grandson of Fiachnae who was of this branch The Fled Dúin na nGéd makes Congal a grandson of Eochaid Buide, King of Dál Riata, which is unconfirmed by other sources but chronologically feasible although it contains an anachronism in that Eochaid Buide's death is recorded years before the Battle of Mag Rath. This would make Congal the son of his ally Domnall Brecc's sister.
Congal is presumed to have become king of the Dál nAraidi in 626 following the death of Fiachnae, but he is unlikely to have ruled as king of the Ulaid until some time after the death of Fiachnae mac Demmáin in 627. He first appears in the record in 628, when he killed Suibne Mend of the Cenél nEógain, supposedly High King of Ireland, at Traig Bréni on the shore of Lough Swilly. This killing may have opened Congal's way to becoming king of the Ulaid, but it also brought Domnall mac Áedo of the Cenél Conaill, Congal's nemesis, to the headship of the Northern Uí Néill. According to the Fled Dúin na nGéd, Domnall was the foster-father of Congal. Domnall had clashed with Suibne earlier that year and it is possible that Domnall and Congal were acting in collusion. This same saga records a slight that Congal suffered at the feast which seems to have turned him against his foster-father. In 629 they clashed and Congal was defeated by Domnall mac Áedo at the Battle of Dún Ceithirn and fled the field of battle. In 629, the Dal nAraide appear to have defeated the Dál Riata at Fid Eóin, killing Connad Cerr, although the victor is named as Maél Caích, perhaps an otherwise unknown brother of Congal. As well as their king, the Dál Riata suffered the loss of two grandsons of Áedán mac Gabráin and the Bernician exile Osric was also killed. It is possible that upon becoming King of Ulaid, Congal resigned the affairs of Dal nAraide to Maél Caích mac Scandail who met opposition from other Criuthne led by Dícuil mac Echach who may have been a member of the Latharna of Larne.
King of Tara
Congal's bid for the kingship of Tara must have occurred after 629. Events in the midlands in the years 633–634 saw Congal's allies the Clann Cholmáin win a number of victories in Leinster and Meath which may be connected with the period of Congal's high kingship. Congal may have also supported the Cenél maic Ercae in their feud with the Cenél Feradaig branch of the Cenél nEógain Congal's epithets cáech and cláen mean "squinting" or "half blind". An ancient law on bees in the Bechbretha, written within a generation of Congal's death, links these epithets with Congal being blinded in one eye by bees owned by Domnall mac Áedo. This, it says, put Congal out of the kingship of Tara. No later sources make Congal a High King of Ireland, which is largely the same as the kingship of Tara, but the Cath Maige Rath echoes the Bechbretha in claiming that the men of Ulaid demanded that the eye of the beekeeper's son – a son of the High King Domnall mac Áedo – be put out in repayment. These tracts may have been part of a propaganda war against Congal who may have faced hostility from the Dal Fiatach and the main Uí Chóelbad dynasty of the Dal nAraide. In the period 635–636 the allies of Domnall mac Áedo seem to have got the better of Congal's allies. In 635 his allies the Clann Cholmáin suffered defeat by their rivals of the Síl nÁedo Sláine, who were allies of Domnall mac Áedo. This may have been the real reason for Domnall Brecc's alliance with Congal as his dynasty was allied to Clann Cholmáin. Domnall may have also been hostile to the Uí Chóelbad dynasty of the Dal nAraide. In 636 the assassination of the Cenél Feradaig king of Ailech failed to displace this branch in favour of Congal's allies the Cenél maic Ercae.
Mag Rath
dominated events in the years that followed, until around 637, when Congal, together with Domnall Brecc of Dál Riata challenged him at the battle of Mag Rath. Domnall mac Áedo was victorious and Congal was killed in the defeat. This battle appears in the Buile Shuibhne and is recounted in the Cath Maige Rath.
Reputation and representations
Congal is the protagonist of the Fled Dúin na nGéd. He appears in the Cath Maige Rath. Irish poetSir Samuel Ferguson wrote a length heroic poem on Congal, loosely based on the Fled Dúin na nGéd, entitled Congal: A Poem in Five Books.
