One figure in this story is the daughter of the giant Ysbaddaden, while another is the cousin of King Arthur.
At the beginning of this work, Kilyddid marries Goleuddydd, however, when she becomes pregnant with his heir, she goes insane, and wanders around the countryside until she eventually gives birth with the help of a swineherd. Such is the birth of one major figure in this work, who later becomes infatuated with a woman he has never seen and travels to Celliwig to ask his cousin for help, after which Twrch Tryth the boar is hunted and slain. One figure in this story is the daughter of the giant Ysbaddaden, while another is the cousin of King Arthur. For ten points, name this Welsh epic whose name is also the name of its two major characters.
At the beginning of this work, Kilyddid marries Goleuddydd, however, when she becomes pregnant with his heir, she goes insane, and wanders around the countryside until she eventually gives birth with the help of a swineherd.
{Culhwch} and {Olwen} [accept: {Culhwch ac Olwen}]