Silver Wheel, and the Three Destinies

Arianrhod (Silver Wheel) is a figure of the Fourth Branch of the Welsh Mabinogi, daughter of Don and sister of the magician Gwydion. Asked to step over a magician's wand to prove her virginity and so qualify as royal footholder, she instead gives birth, to a boy who becomes the sea-associated Dylan, and to a second child that Gwydion snatches up and rears.

Angered and shamed, Arianrhod lays three destinies (tynghedau) on this second son: that he shall have no name, no arms and no wife of any race now on earth unless she herself grant them, prohibitions that Gwydion overcomes each in turn by trickery, so that the boy gains the name Lleu Llaw Gyffes, receives arms from his mother by a ruse, and is given a wife, Blodeuwedd, conjured out of flowers. Her name, and the caer later attached to the constellation Corona Borealis, have encouraged readings of Arianrhod as a star- or moon-associated figure, but such astral interpretations are later inference; in the Mabinogi itself she is a proud and formidable woman of the tale.