One companion of this figure kills Gwrnach the Giant, and he and his companions have three poisoned darts thrown at them, which they throw back at their attacker.  
This figure threatens Glewlwyd Gavaelvawr that he will let loose three shouts that will make barren every woman in a palace, and this figure apparently got his name because he was born in a swine's burrow.  This man gives a gold ring to Custennin the herdsman, whose son Goreu accomplishes a task for him, and this man's mother made his father promise not to remarry until a briar with two blossoms grows on her grave.   One companion of this figure kills Gwrnach the Giant, and he and his companions have three poisoned darts thrown at them, which they throw back at their attacker.  This figure's step-mother declares that he will not have a wife until he obtains a certain woman, whom this man obtains by accomplishing the tasks of Yspaddaden Penkawr with the help of such figures as Bedwyr and Kai.  For 10 points, name this figure from Welsh myth, a cousin of Arthur who goes on a quest to win the hand of Olwen.
This figure threatens Glewlwyd Gavaelvawr that he will let loose three shouts that will make barren every woman in a palace, and this figure apparently got his name because he was born in a swine's burrow.  
{Culhwch}