Given the task definition and input, reply with output. In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

Once, while hunting, he pursued a white boar only to be found later touching a golden bowl; he was freed when his wife caught a mouse, which was the wife of a magician, and the magician freed him. Though he then owed his freedom to his wife Cigfa, he already owed his life to his foster father, who had seen a mysterious beast outside his stable and came out to kill it; having found the baby, he called him Gwn of the Golden Hair until Teyrnon realized who he was. He was once tricked by Gwydion into giving him his pigs, and the resulting war was settled by single combat, which he lost. For 10 points, identify this king of Dyfed about whom the rumor was spread that he was eaten shortly after birth by Rhiannon.
Social Science