Sir Orfeo as being a parallel dimension to the everyday world rather than the Land of the Dead as in the Greek myth of Orpheus and Eurydice. The ability to move between one world and the other distinguishes the tale as told in its various British versions such as "Sir Orfeo" and the Shetland ballad "King Orfeo" where the captors are envisaged as inhabitants of a parallel fairy domain rather than as the infernal region of the Dead ruled over by Hades as in the Greek myth. Katharine Briggs sees the tale as related in British folk narratives as being equally influenced
Christian views on Hades the souls of the wicked are in a state the reverse of this." The Latin word "infernus" or "infernum" (underworld) indicated the abode of the dead and so was used as the equivalent of the Greek word "ᾅδης" (hades). It appears in both the documents quoted above, and pointed more obviously than the Greek word to an existence beneath the earth. Later, the transliteration "hades" of the Greek word ceased to be used in Latin and "infernum" became the normal way of expressing the idea of Hades. Though "infernus" is usually translated into English as "hell", it did not have