he battle of Magh Rath, fought A.D. 637, is one of the most important recorded in the Irish annals; it is mentioned by Adamnan, Abbot of Iona; by the Annalist Tighernach; also in the Chronicon Scotorum, the Annals of the Four Masters, and O’Flaherty’s Ogygia. The entry of Tighernach is as follows :-” A.D. 637.-The Battle of Magh Bath was fought by Domhnall, son of Aedh, and by the sons of Aedh Slaine, (but Domhnall at this time ruled Temoria), in which fell Congal Cacth, King of Uladh, and Faelan, with many nobles; and in which fell Suibhne, the son of Colman Cuar.” O’Flaherty’s entry is much more minute and copious. We quote from Hely’s translation :- “In the year 637, the battle of Moy-rath, in Ulster, is fought by Domnald the Second, King of Ireland, and the sons of Aid Slany, monarch of Ireland, against Congall Olaen, the son of Scandal, King of Ulidia, who was [had been] vanquished in a battle at Dun Kethern, in the year 629, and banished into Britain for his factious and aspiring measures. He levied a great army for this battle, composed of Albanian Scots, with their king Domnall Brec and his brothers, of Picts, Anglo-Saxons, and Britons. In this battle, which continued for seven days, Congall was killed, the rest obliged to fly in the utmost consternation, and Suwney, the son of Cuar, lord of Dalaradia, was drowned. Concerning this war, Adamnan says as follows:-‘ This prediction was fulfilled in our days, in the war of Rath, when Domnal Bree, the grandson of Aidan, was depopulating, without any provocation, the provinces of Domnill, the grandson of Ainmireeh; and, from that day to this, they have been reduced to the last extremity by foreigners: which gives me the most heartfelt concern.'” But the longest and most interesting account of this battle is found in a historical tale of the fifteenth century, the “Cath Muighe Rath”, translated and edited by Dr. O’Donovan, for the Irish Archeological Society, in 1842 and which the editor says has been evidently compiled from earlier accounts.