Drawing on myth, folklore and history, the stories of the Mabinogion passed from generations of storytellers before they were written down in the thirteenth century in the form we know. Set in dual realms of the forests and valleys of Wales and the shadowy otherworld, the tales are permeated by a dreamlike atmosphere. In ''Math Son of Mathonwy'' two brothers plot to carry off the virginal Goewin, while in ''Manawydan Son of Ll^yr'' a chieftain roams throughout Britain after a spell is cast over his land. And King Arthur''s court provides the backdrop to tales such as ''How Culhwch Won Olwen'', in which a young man must complete many tasks before he can marry a giant''s daughter.