Erebus, a region of utter darkness in the depths of Hades, into which no mortal ever penetrated, the proper abode of Pluto and his Queen with their train of attendants, such as the Erinnyes, through which the spirits of the dead must pass on their way to Hades; equivalent to the valley of the shadow of death.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Erdmann * Erectheus