Olwen

In Welsh mythology, Olwen 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.