Domnall Midi - King of Uisnech, King of Mide

King of Uisnech, King of Mide

According to later king lists such as those in the Book of Leinster, Domnall succeeded his father as king of Uisnech on the latter's death. If this is correct, the Irish annals take no notice of him, and it is not until 730 that he is first mentioned. During this time, the internecine conflict within the Síl nÁedo Sláine continued. Fergal mac Máele Dúin had died in battle in Leinster in 722. Fogartach mac Néill, who had returned to Ireland in 716 and was once again chief king among the southern Uí Néill, and latterly Fergal's deputy, succeeded him. Fogartach was killed in battle against his Síl nÁedo Sláine kinsman Cináed mac Írgalaig in 724. Cináed was killed in 728 fighting against Flaithbertach mac Loingsig of the northern Cenél Conaill who became High King after this victory.

In the early 730s war broke out among the northern Uí Néill. Flaithbertach was defeated in 732 by Fergal's elder son Áed Allán and the Cenél Conaill were again defeated by Áed in 733 when Fergus, son of Congal Cendmagair, was killed. Flaithbertach was again defeated by Áed in 734. The Annals of Ulster, which rarely record the beginnings of the reigns of high kings in this period, record that Áed was inaugurated later in 734. Flaithbertach had been deposed, although he survived and entered religion, dying in 765, having outlived two successors.

Perhaps taking advantage of this strife, the King of Munster, Cathal mac Finguine, invaded the midlands in 733. Cathal encamped at Tailtiu, where the Uí Néill high kings traditionally held their main óenach. He was attacked there by Domnall and driven off although he later defeated the minor Uí Néill kindred of Clann Cholmáin Bicc led by Fallomon mac Con Congalt at the Hill of Ward, the site of another major Uí Néill óenach.

Áed Allán's reign was remembered as a time of war. He began by attacking his traditional enemies, the Ulaid, in 735. Áed Róin, the King of Ulster, was killed at a battle near Faughart. The war among the Síl nÁedo Sláine continued in 737 and that same year Áed met with Cathal mac Finguine at Terryglass. Exactly what was agreed there is unknown, but the annals also state that the law of Saint Patrick was in force throughout Ireland. It may be that Áed and Cathal agreed on an alliance against Leinster. Áed's father Fergal had been killed campaigning there, and the annals are full of Cathal's generally unsuccessful campaigns against the Leinstermen. In the following Áed and Cathal separately attacked Leinster. Áed's invasion led to the battle of Áth Senaig, fought on 14 September 738 near Ballyshannon, County Kildare, also called the battle of the groans. This was a crushing defeat for Leinster. Their king, Áed mac Colggen, was killed, as was Bran Becc mac Murchado. The Annals of Ulster say: "so many fell in this great battle that we find no comparable slaughter in a single onslaught and fierce conflict throughout all preceding ages." Later Cathal campaigned in Leinster and apparently took hostages and tribute from the new king, perhaps Fáelán mac Murchado.

In 739 the Annals of Ulster record that some of Domnall's household were burned to death in a banqueting hall at the unidentified Bodbráith. The enemy are not named. The following year Domnall, it is reported, "went off into clerical life".