the Cenél Conaill, Domnall's hold on power can only have been helped by fighting amongst the other kindreds of the Uí Néill, war amongst Cenél nEógain reported in 630, and between Clann Cholmáin and the Síl nÁedo Sláine in 634–635. In 637, Domnall faced another challenge from Congal Cáech and the Ulaid. Congal was joined by Domnall Brecc, king of Dál Riata, and by the Cenél nEógain. Domnall was aided by the Síl nÁedo Sláine. The battle of Mag Rath (Moira, County Down) was a decisive victory for the High King and Congal Cáech was killed. On the same day as Mag Rath, the battle of Sailtír (off Kintyre), fought between Domnall's fleet, led by his nephew Conall Cáel mac Máele Cobo, and a fleet of the Cenél nEógain and Dál Riata, was won by the High King's forces. The Ulaid were not the main sufferers, however, as the Dál Riata are thought to have lost their lands in County Antrim as a result of the battle. Mag Rath was attached to the Buile Shuibhne, the tale of a fictitious Dál nAraidi king named Suibhne Gelt, which is probably much older in origin. The Annals of Tigernach report the death of Domnall's wife Duinseach in 641. Domnall died at the end of January of 642, perhaps after a long illness. Domnall was followed as king of the Cenél Conaill by his nephew Cellach mac Máele Cobo. Domnall's sons included Óengus mac Domnaill (died 650), father of Loingsech mac Óengusso (died 703), high king of Ireland; Fergus Fanát, father of Congal Cennmagair (died 710), also high king; Ailill Flann Esa (died 666) as well as Conall and Colcu (both died 663). Notes References Adomnán, Life of St Columba, tr. & ed. Richard Sharpe. Penguin, London, 1995. Byrne, Francis John, Irish Kings and High-Kings. Batsford, London, 1973. Ó Cróinín, Dáibhí, Early Medieval Ireland: 400–1200. Longman, London, 1995. External links CELT: Corpus of Electronic Texts at University College Cork The Corpus of Electronic Texts includes the Annals of Ulster, Tigernach and the Four Masters and the Buile Shuibhne as well as Genealogies, and various Saints' Lives. Most are translated into English, or translations are in progress 6th-century births 642 deaths High Kings of Ireland 7th-century Irish monarchs