The Twins of the Tylwyth Teg is based on a well known story in Welsh folklore about a herd boy who marries a faery from under the lake. Before her father will allow her to marry him however, he has to choose between her and her identical twin sister.
Taliesin and Avagddu is based on the tale from the Welsh Mabinogion. Ceridwen brews up a cauldron of magic to give her misshapen son Avagddu extraordinary wisdom, but the village boy who is employed to stir the cauldron sips it instead and becomes the greatest prophet and bard Wales has ever known -- Taliesin.
Bran, Branwen and Evnissyen is based on a story from the Welsh Mabinogion about the war between mainland Britain and Ireland in mythic times. Evnissyen, the bitter and disgruntled half-brother of Bran, the Blessed, stirs up trouble in which both nations are almost destroyed.
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