Erebus

Erebus, or Erebos, was often conceived as a primordial deity, representing the personification of darkness; for instance, Hesiod's Theogony identifies him as one of the first five beings in existence, born of Chaos. Erebus features little in Greek mythology and literature, but is said to have fathered several other deities with Nyx; depending on the sources of the mythology, this union includes Aether, Hemera, the Hesperides, Hypnos, the Moirai, Geras, Styx, Charon, and Thanatos.

In Greek literature, the name Erebus is also used for a region of the underworld where the dead pass immediately through after dying and is sometimes used interchangeably with Tartarus.