She curses the men of Ulster to suffer her labour pains in the hour of their greatest need, which is why none of the Ulstermen but Cúchulainn is able to fight in the ''Táin Bó Cuailnge'' (Cattle Raid of Cooley).
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The widower Cruinniuc Mac Agnomain of the Ulaid and his sons are visited by a mysterious and beautiful woman who stays in his stronghold and becomes his wife bringing him great prosperity.
Subsequently the Ulaid stage a festival including horse-races in which the Kings' horses appear unbeatable but at the close of the day Cruinniuc claims that his wife could beat any of the horses there assembled.
The King hears of this and takes Cruinniuc captive threatening to kill him should his wife loose in a race against the Kings' stable of racehorces.