In Welsh mythology, Olwen (or Olwyn) is the daughter of the giant Ysbaddaden and cousin of Goreu. She is the heroine of the story Culhwch and Olwen in the Mabinogion. Her father is fated to die if she ever marries, so when Culhwch (sometimes spelled as Kilhwch) comes to court her, he is given a series of immensely difficult tasks which he must complete before he can win her hand. With the help of his cousin King Arthur, Culhwch succeeds and the giant dies, allowing Olwen to marry her suitor.
In the tale Culhwch and Olwen in the Mabinogion, she is described as a vision of beauty: wearing a flaming-red dress with a red-gold torc and many golden rings, she has "hair yellower than the broom", red (ruddy) cheeks, white skin and pale hands. She is also depicted as having the ability to spring white flowers from every step she takes.
The meaning of the name Olwen is "white footprint" or "white track". According to legend, she was so gentle and fragile that white trefoils would grow in her footprints. Some authorities consider her to have been originally a solar goddess, based on the etymology of her name and light-related attributes