Morpheus was the god of dreams in greek mythology. He was one of the three Oneiroi, sons of the god of sleep, Hypnos. Along with his two brothers, Phobetor (“nightmares”) and Phantasos (“illusion”), he was a diety of the underworld and would appear in the
Hades (also known as Haides, Aides, Aidoneus, or Ἁδης) was King of the Underworld and God of death and the dead. He presided over funeral rites and defended the rights of the dead. Hades was also the God of the hidden wealth of the earth presiding over
Pluto the Roman god of the underworld (equivalent to Hades in Greek Mythology). Pluto is the one, dazzled by Orpheus' music, that strikes the deal with him: he can have Eurydice back if he doesn't look back while leaving the land of the dead.