Colla Uais

The Three Collas were, according to medieval Irish legend and historical tradition, the fourth-century sons of Eochaid Doimlén, son of Cairbre Lifechair. Their names were: Cairell Colla Uais; Muiredach Colla Fo Chrí (also spelt Colla Dá Crich, or Fochrich); and Áed Colla Menn. Colla Uais ruled as High King of Ireland for four years.

According to tradition, the Three Collas killed their uncle, Fíacha Sroiptine, at the Battle of Dubhchomar, in Crioch Rois, Breagh, with Colla Uais taking the kingship. It was prophesied that whoever killed them, his descendants would never rule Ireland. Colla Uais ruled in Fíacha's place for three years (323-326 AD), and as High-King of Ireland for four years, until Fiacha's son Muiredach Tirech banished the Three Collas, exiling them and three hundred followers to Alba (Scotland).

The mother of Three Collas was said to be Ailech, the daughter of Udhaire, king of Alba. According to Keating's version Udhaire put them in command of three hundred warriors. After that they returned to Ireland, hoping that Muiredach might kill them, and deprive his descendants of the throne. But Muiredach knew of the prophecy, and despite knowing they had killed his father, took them into his service.

After several years, Muiredach decided the Collas should have territory of their own, and sent them to conquer Ulster. With an army drawn from Connacht, they fought seven battles in a week against the Ulaid at Achaidh Leithdeircc, killing Fergus Foga, king of Ulster, in the seventh. Colla Menn also died in this battle. They burned Emain Macha, the Ulster capital, after which it was abandoned, and seized substantial territories in mid-Ulster, thought to be the origin of the kingdom of Airgíalla.

The chronology of Keating's Foras Feasa ar Éirinn dates Colla Uais' High Kingship to 306–310. The Annals of the Four Masters dates his High Kingship to 322–326, and his destruction of Emain Macha and conquest of Ulster to 331. However, the chronology of early Irish historical tradition is known to be artificial. One story makes Fiachra Cassán of the Airgíalla, son of Colla Fo Chrí, the foster-father of Cormac mac Airt, who according to the usual chronology was his own great great grandfather, and an alternative tradition dated the fall of Emain Macha to 450.

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