Wikipedia
Creirwy
Creirwy is a figure in the Mabinogion and the Hanes Taliesin (the story of Taliesin's life), daughter of the enchantress Ceridwen and Tegid Foel ("Tacitus the Bald"). The Welsh Triads name her one of the three most beautiful maids of the Isle of Britain. Born in Penllyn in Powys, Wales, Creirwy (also known as Llywy) has a dark, hideous brother named Morfran and a foster brother, Gwion Bach (who would become the bard Taliesin). She does not appear in the stories about Afagddu and Taliesin.