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
Hades death, although Euripides' play ""Alkestis"" states fairly clearly that Thanatos and Hades were one and the same deity, and gives an interesting description of Hades as being dark-cloaked and winged; moreover, Hades was also referred to as "Hesperos Theos" ("god of darkness"). When the Greeks propitiated Hades, they banged their hands on the ground to be sure he would hear them. Black animals, such as sheep, were sacrificed to him, and the very vehemence of the rejection of human sacrifice expressed in myth suggests an unspoken memory of some distant past. The blood from all chthonic sacrifices including those to