‘Birds of Rhiannon’

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Three supernatural birds, belonging to the goddess Rhiannon. They were said to

wake the dead and lull the living to sleep.

Culhwch had a task given to him by Ysbaddaden Bencawr – to retrieve the birds for them to soothe him on his last night of life.

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Sources
Mabinogion | Written in 12th to 13th centuries.
Culhwch and Olwen | Written c. 1400.