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
Hades left Helen with Theseus' mother, Aethra, and traveled to the Underworld. Hades knew of their plan to capture his wife, so he pretended to offer them hospitality and set a feast; as soon as the pair sat down, snakes coiled around their feet and held them there. Theseus was eventually rescued by Heracles but Pirithous remained trapped as punishment for daring to seek the wife of a god for his own. Heracles' final labour was to capture Cerberus. First, Heracles went to Eleusis to be initiated into the Eleusinian Mysteries. He did this to absolve himself of guilt for killing