The King of Leinster

The Annals of Ulster mention that, in the Battle of Áth Dara in 458, Crimthann mac Énnai led the Laigin forces against high king Lóegaire mac Néill, resulting in Leinster not having to pay the high king a levy of cattle tribute after that.

Crimthann came from a highly respected lineage, the Uí Cheinnselaig, a Leinster dynasty that traced its line all the way back to the legendary Niall of the Nine Hostages, ancestor of the Uí Néill ("O'Neill") dynasties that ruled Ireland from the 6th to the 10th centuries.

If he had the throne by the time of that battle, he held it for a decent amount of time (for a culture fraught with fighting): he died in 483 after being wounded in a battle with those who were also Laigin from south of Leinster.

He had at least two children from his marriage. His son, Nath Í mac Crimthann, became king after him. He also had a daughter, Eithne Uatahach, who married Óengus mac Nad Froích (d.490), the first Christian king of Munster.

The reason that Crimthann's daughter was willing to marry a Christian in the 5th century was because she had been raised as a Christian. Crimthann had been converted and baptized by St. Patrick himself, a significant occurrence for an early Irish king.

Because Crimthann was a Christian, when one of his vassals brought him a problem girl named Brigid, and Crimthann saw that Brigid was inclined to give away her master's property to aid the poor, Crimthann recognized in her something special. Rather than support the idea of punishing her, he suggested to his vassal, Dubhthach, that the girl be freed from bondage. This was, of course, Brigid of Kildare, whose story we began yesterday, and which we will continue tomorrow.