Orpheus (north east Danube valley) and even describes him wandering into Hyperborea and Tanais (ancient Greek city in the Don river delta) due to his grief. The story of Eurydice may actually be a late addition to the Orpheus myths. In particular, the name "Eurudike" ("she whose justice extends widely") recalls cult-titles attached to Persephone. According to the theories of poet Robert Graves, the myth may have been derived from another Orpheus legend, in which he travels to Tartarus and charms the goddess Hecate. The myth theme of not looking back, an essential precaution in Jason's raising of chthonic Brimo Hekate
Orpheus son of the Thracian king Oeagrus and the Muse Calliope. Greeks of the Classical age venerated Orpheus as the greatest of all poets and musicians; it was said that while Hermes had invented the lyre, Orpheus had perfected it. Poets such as Simonides of Ceos said that Orpheus' music and singing could charm the birds, fish and wild beasts, coax the trees and rocks into dance, and divert the course of rivers. Orpheus was one of the handful of Greek heroes to visit the Underworld and return; his music and song even had power over Hades. Some sources credit Orpheus