A still more remarkable poem,--the last that remains to be noticed,--in which certain strange deeds of Arthur are commemorated, is found in _The Book of Taliesin_ under the name of ‘Preiddeu Annwvn,’ or ‘The Spoils of Hades.’ It refers to various expeditions made by Arthur and his men, in his ship Pridwen to certain mysterious regions oversea. Definite names enough are given to the different places visited--Caer Sidi, Caer Rigor, Caer Vandwy, and so on,--but the places themselves remain quite unidentified. “Three freights of Pridwen,” sings the bard, “were they who went with Arthur” on these expeditions; “seven alone were we who returned” therefrom. One of the exploits achieved in the course of these voyages was, apparently, the rape of a cauldron belonging to the King of Hades, and the whole poem, according to Rhys,[57] “evidently deals with expeditions conducted by Arthur by sea to the realms of twilight and darkness.” The last two poems here referred to have several features in common with what is, probably, the oldest of the Arthurian prose tales in Welsh,--the story of _Kulhwch and Olwen_. That story also tells of the rape of a cauldron, belonging not, indeed, to the King of Hades, but to one Diwrnach, who lived across the sea in Ireland; Arthur went in quest of it, with a small retinue, in his ship Pridwen, and brought it home “full of Irish money.” The second of the two poems refers to “a speckled ox” (_ych brych_), and the acquisition of “a speckled ox” was one of the tasks imposed upon Kulhwch by Olwen’s father as part of the price to be paid for her hand. Again, nearly all the persons mentioned in _The Black Book_ dialogue between Arthur and Glewlwyd figure also in _Kulhwch and Olwen_. So, where the oldest Welsh Arthurian poetry comes into contact with the oldest Welsh prose, the Arthur that we find dimly outlined in both is a purely mythical hero.