[1] The story is told that he was so consumed with jealousy for his brother that he wasted away to almost nothing, from which he gained his epithet Cóel Breg, the "meagre of Brega".
As he lay on his bier, Lóegaire prostrated himself over his body in grief, and Cobthach stabbed him with a dagger.
He paid someone to poison Lóegaire's son, Ailill Áine, and forced Ailill's son Labraid to eat part of his father's and grandfather's hearts, and a mouse, and forced him into exile – according to one version, because it had been said that Labraid was the most hospitable man in Ireland.
[2] Cobthach later made peace with Labraid, now known by the epithet Loingsech, "the exile", and gave him the province of Leinster, but relations broke down again and war broke out between them, and Labraid burned Cobthach and his followers to death in an iron house at Dind Ríg, marking a rift in the house of Erimon.
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