Congal Cáech (also Congal Cláen) was a king of the Cruithne of Dál nAraidi, in modern Ulster, from around 626 to 637. He was king of Ulster from 627-637 and, according to some sources, High King of Ireland.
The sources for Congal's life and times are limited and generally date from long after his death. The Irish annals are for this period believed to be largely based on an annal kept on the island of Iona, where Saint Columba had founded a monastery in the middle 6th century. These annals survive only in later copies. Of these, the Annals of Ulster and the Annals of Tigernach are generally considered to be the most reliable and representative of the original material. Congal does not appear directly in Adomnán's Life of Saint Columba, another early source for Irish history, but a number of his contemporaries do and it supplies some context for events. He is mentioned in the Early Irish Law tract Brecbetha—on beekeeping—written in the later 7th century; this purports to explain Congal's epithets.
He also appears later and less reliable materials such as verse and prose tales, including the Cath Maige Rátha (The Battle of Mag Rath) and Fled Dúin na nGéd (The Feast of Dún na nGéd, literally The Feast at the Fort of the Geese), both of which date from the Middle Irish period, perhaps the early 10th century for the Cath Maige Rátha and the 11th or 12th, perhaps later, for Fled Dúin na nGéd. Those genealogies which include Congal are contradictory.
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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 (Ulster) 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.
King of Ulaid 
Congal is presumed to have become king of the Dál nAraidi in 626 following the death of Fiachnae, but he is unlikely to have imposed himself 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 (Duncairn, near Coleraine, modern County Londonderry) 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 (perhaps a son of Æthelfrith) 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 (a Dal nAraide tribe).
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 favor of Congal's allies the Cenél maic Ercae.
Mag Rath 
Domnall mac Áedo 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 (Moira, County Down). 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 poet Sir Samuel Ferguson wrote a length heroic poem on Congal, loosely based on the Fled Dúin na nGéd, entitled Congal: A Poem in Five Books (1907).
- Byrne, Table 7
- Byrne, pg.109
- Charles-Edwards, pg.60
- Bannerman, Studies, pp. 95–96; O Donovan, Banquet, pp. 44–45. The tale also has Congal send for aid to the "king of France" and mentions three otherwise brothers of Domnall Brecc: Congal Menn, Áed and Suibne. These do not appear in the Senchus fer n-Alban and are presumed to be poetic invention, along with the "king of France".
- Annals of Ulster AU 628.3; Annals of Tigernach AT 630.3; Mac Niocaill, pg.95
- Mac Niocaill, pg.95
- AU 629.2; AT 631.3; Mac Niocaill, pg.95, Byrne, pg.112; Ó Cróinín pg.50
- AU 629.1; AT 631.1; Mac Niocaill, pg.95, Byrne, pg.109
- Mac Niocaill, pg.95; Byrne, pg.109
- Charles-Edwards, pg.498
- Charles-Edwards, pg.495
- Charles-Edwards, pg.60, 497-498
- Mac Niocaill, pg.96
- Annals of Ulster AD 431–1201, CELT: Corpus of Electronic Texts, 2003, retrieved 2008-03-23
- Annals of Tigernach, CELT: Corpus of Electronic Texts, 1996, retrieved 2008-03-23
- Fled Dúin na nGéd, CELT: Corpus of Electronic Texts, 2000, retrieved 2008-03-30
- Sharpe, Richard, ed. (1995), Adomnán of Iona: Life of Saint Columba, London: Penguin, ISBN 0-14-044462-9
- Adamson, Ian (1998), Dalaradia: Kingdom of the Cruthin, Belfast: Pretani Press, ISBN 0-948868-26-0
- Bannerman, John (1974), Studies in the History of Dalriada, Edinburgh: Scottish Academic Press, ISBN 0-7011-2040-1
- Byrne, Francis John (1973), Irish Kings and High-Kings, London: Batsford, ISBN 0-7134-5882-8
- Charles-Edwards, T. M. (2004), "Congal Cáech (d. 637)", Oxford Dictionary of National Biography, Oxford: Oxford University Press, retrieved 2007-10-22
- Charles-Edwards, T. M. (Feb 2004), Domnall mac Áeda (d. 642), "Effects of residual single-quantum coherences in intermolecular multiple-quantum coherence studies.", Journal of magnetic resonance (San Diego, Calif. : 1997) (Oxford: Oxford University Press) 166 (2): 215–27, doi:10.1016/j.jmr.2003.10.017, PMID 14729033, retrieved 2007-10-25 More than one of
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- Charles-Edwards, T. M., Early Christian Ireland, Cambridge: Cambridge University Press, ISBN 0-521-36395-0
- Ferguson, Samuel (1918), in Graves, Alfred P., Poems of Sir Samuel Ferguson, Dublin: Talbot Press, retrieved 2008-03-30
- Kelly, Fergus (1988). A Guide to Early Irish Law. Early Irish Law Series 3. Dublin: DIAS. ISBN 0901282952.
- Mac Niocaill, Gearoid (1972), Ireland before the Vikings, Dublin: Gill and Macmillan
- Marstrander, Carl (1911), "A New Version of the Battle of Mag Rath", Ériu 5: 226–247
- Ó Cróinín, Dáibhí (1995), Early Medieval Ireland: 400–1200, The Longman History of Ireland, London: Longman, ISBN 0-582-01565-0
- O Donovan, John (1826), The Banquet of Dun Na N-Gedh and The Battle of Magh Rath, Dublin: Irish Archaeological Society
- Wiley, Dan M. (2005), "Fled Dúin na nGéd", The Cycles of the Kings, retrieved 2007-04-04