A certain correspondence to these Irish beliefs is found in Brythonic story, but here the Elysium conception has been influenced by Christian ideas. Elysium is called Annwfn, meaning “an abyss,” “the state of the dead,” “hell,” and it is also conceived of as is elfydd, “beneath the earth."[1245] But in the tales it bears no likeness to these meanings of the word, save in so far as it has been confused by their Christian redactors with hell. It is a region on the earth’s surface or an over-or under-sea world, in which some of the characteristics of the Irish Elysium are found—a cauldron, a well of drink sweeter than wine, and animals greatly desired by mortals, while it is of great beauty and its people are not subject to death or disease. Hence the name Annwfn has probably taken the place of some earlier pagan title of Elysium.
In the tale of Pwyll, the earliest reference to Annwfn occurs. It is ruled by Arawn, at war with Hafgan. Arawn obtains the help of Pwyll by exchanging kingdoms with him for a year, and Pwyll defeats Hafgan. It is a beautiful land, where merriment and feasting go on continuously, and its queen is of great loveliness. It has no subterranean character, and is conceived apparently as contiguous to Pwyll’s kingdom.[1246] In other tales it is the land whence Gwydion and others obtain various animals.[1247] The later folk-conception of the demoniac dogs of Annwfn may be based on an old myth of dogs with which its king hunted. These are referred to in the story of Pwyll.[1248]