In Greek mythology, Erebus (; Ancient Greek: Ἔρεβος, romanized: Érebos, lit. 'darkness, gloom'), or Erebos, is the personification of darkness. In Hesiod's Theogony, he is the offspring of Chaos, and the father of Aether and Hemera (Day) by Nyx (Night); in other Greek cosmogonies, he is the father of Aether, Eros, and Metis, or the first ruler of the gods. In genealogies given by Roman authors, he begets a large progeny of personifications upon Nox (the Roman equivalent of Nyx), while in an Orphic theogony, he is the offspring of Chronos (Time).
The name "Erebus" is also used to refer either to the darkness of the underworld, the underworld itself, or the region through which souls pass to reach the underworld, and can sometimes be used as a synonym for Tartarus or Hades.
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Etymology
The meaning of the word Érebos (Ἔρεβος) is "darkness" or "gloom", referring to that of the underworld. It derives from the Proto-Indo-European *h₁regʷ-os- ("darkness"), and is cognate with the Sanskrit rájas ("dark (lower) air, dust"), the Armenian erek ("evening"), the Gothic riqis, and the Old Norse røkkr ("dark, dust").
Personification of darkness
In a number of Greek cosmogonies, Erebus is described as one of the first beings to exist. In Hesiod's Theogony (late 8th century BC), which the Greeks considered the "standard" account of the origin of the gods, he is the offspring of Chaos, alongside Nyx (Night). In the first instance of sexual intercourse, he mates with Nyx, producing Aether and Hemera (Day), the pair of which represent the personified opposites of their parents. The Neoplatonist Damascius attributes to Acusilaus (6th century BC) a cosmogony in which Chaos is the first principle, after which comes Erebus and Night, and from this pair are then born Aether, Eros, and Metis. The philosopher Philodemus records that in the work On the Gods by one "Satyros", Erebus is the first of five rulers of the gods, and is succeeded as sovereign by Chaos (though others have suggested this figure may be Eros). According to a hymn by the poet Antagoras (3rd century BC), one of the possible parentages of Eros is Erebus and Night.


