The Book of Taliesin
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The Book of Taliesin contains the fascinating poem, 'Preiddiau Annwfn' ('The Spoils of Annwfn'), in which the poet-prophet boasts of his universal knowledge, part of which was gained when he and Arthur travelled together in Arthur's ship Prydwen to a series of Otherworldly islands. Image 7 shows this poem, where Arthur's name is mentioned first at the head of the seventh line of f. 55r (the right-hand page).
Image 7