Here are listed my favourite Celtic Myths and Legends. together with their source.

The first one, of course, will be about ARIANRHOD

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Arianrhod is the Welsh goddess of Full Moon. Her name means "Silver Wheel" (the moon). She lives in her castle, Caer Arianrhod (the Corona Borealis) in the Otherworld. She is also the daughter of the mother-goddess Don.

Arianrhod is an initiatress and a lady of destiny. In the prisons of her castle Taliesin (the great bard) got his initiation

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The Story of Arianrhod (Wales)

King Math ab Mathonwy had very strange infirmity. In peace-time he could not live unless he had his feet in the lap of a virgin; in time of war he could live only by riding his horse. Now, his nephew, Gilvaethwy, fell in love with the young virgin "in service", and with the help of his brother Gwydion - who got Math out of the way by starting a war - he managed to rape the girl.

When the war ended and Math returned, he found out that the girl could no longer perform her duty. Math punished his two nephews, but also asked their advice about replacing the virgin the sooner. Gwydion suggested his sister, Arianrhod. Math summoned the girl and asked her if she were a virgin, to which she replied that she was. To be sure, Math ordered her to have a test. He took his magic wand, bent it, and told her to step over it. at the very moment she stepped over the wand, she gave birth to two children. Gwydion took the second one and hid him from his mother.

The first child wan named Dylan Eil ton ("Son of the Wave"), and he became as good a swimmer as the fastest fish. Gwydion brought up the other child in secret. Then, one day, he took him to Arianrhod's castle. she welcomed her brother and asked who the child was. when Gwydion told her that the child was her son, Arianrhod became angry. When she asked her brother the name of his son, and he answered that he had none, Arianrhod pronounced a curse: he was destined not to have a name until she would have given him one.

Gwydion went away from the castle and used his magic powers to return there disguised as a shoe-maker, accompanied by the child, who had also been disguised. Arianrhod received them and tried their shoes on. At that moment a wren flew by and the child killed it with one thrust of a javelin. Arianrhod laughed at this and said: "The lion (llew) has a really sure hand (llaw gyffes)". Immediately,Gwydion broke the spell and told his sister that she had just given her son a name. He would be called Llew Llaw Gyffes. Furious, Arianrhoduttered a second curse: the child would have no weapon other than she gave him.

When Gwydion succeeded in breaking this geas, too, Arianrhod was even more furious and made a third curse: Llew would never have a human wife. But Gwydion, with the help of Math and by magic, made a woman out of flowers, gave her the name of Blodeuwedd. She and Llew got married

from "Mabinogion"