Bláthnat is a figure in Irish legend.

Her father is either Mend of Inis Fer Falga (identified as the Isle of Man), Iuchna or Midhir, the fairy king of Brí Léith (located in County Westmeath).

Her father's kingdom was invaded by warriors of the Red Branch of Ulster, led by Cú Roí and Cúchulainn. The raid led to her capture, along with several cattle and a magic cauldron. Despite her being in love with Cúchulainn, she was chosen by Cú Roí as his personal spoil and marries her, leading to a dispute between the two warriors.

Later, she betrays her husband to his enemies, pouring milk into the River Finglas as a signal that he was at home. subsequent to this treachery, Cú Roí is slain by Cúchulainn.

She is later killed by Cú Roí's bard Fercherdne, who avenges his master by throwing both himself and Blathnát from a cliff.

Her name means "like a flower".

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