High Quality Content by WIKIPEDIA articles! Preiddeu Annwfn or Preiddeu Annwn (English: The Spoils of Annwfn) is a cryptic early medieval Welsh poem of sixty lines found in the Book of Taliesin. The text recounts an expedition with King Arthur to Annwfn or Annwn, a Welsh otherworld. A number of scholars have pointed out analogues in other medieval Welsh literature, and the text has attracted interest from those who suggest that it represents a tradition that evolved into the Holy Grail theme of later Arthurian literature.