In Greek mythology, Aether, Æther, Aither, or Ether is the personification of the bright upper sky. According to Hesiod, he was the son of Erebus (Darkness) and Nyx (Night), and the brother of Hemera (Day). In Orphic cosmogony Aether was the offspring of Chronos (Time), and the brother of Chaos and Erebus.

In Greek mythology, Tartarus is the deep abyss that is used as a dungeon of torment and suffering for the wicked and as the prison for the Titans. Tartarus is the place where, according to Plato's Gorgias, souls are judged after death and where the wicked received divine punishment. Tartarus appears in early Greek cosmology, such as in Hesiod's Theogony, where the personified Tartarus is described as one of the earliest beings to exist, alongside Chaos and Gaia (Earth).