Her father was a vicious monster that would die if separated from her. Culwch came to court her, along with his friend Mabon ap Modron. After many trials and tribulations, he succeeded and Ysbaddaden died, his powers and life transferring to Culwch.
In Welsh mythology, Olwen is the daughter of the giant Ysbaddaden.
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 comes to court her, he is given a series of immensely difficult tasks he must complete before he can win her hand.
The friendship Olwen develops with Mark turns to romance only to be terminated cruelly when he sees her without her protective disguise and reacts with shock and horror.
Olwen determines to avoid their prejudices and inability to see beyond appearances by moving the base further up the mountains into isolation from the colony.
Olwen is a well-developed, strong, and appealing character who, despite her painful coming of age, faces her disillusionment with humans in a dignified and admirable manner.