One of the most important goddesses of reconstructed Proto-Indo-European religion is the personification of dawn as a beautiful young woman. Her name is reconstructed as Hausōs or Ausōs (PIE *h₂ewsṓs- or *h₂ausōs-, an s-stem), besides numerous epithets.
Derivatives of *h₂ewsṓs in the historical mythologies of Indo-European peoples include Indian Uṣas, Greek Ἠώς (Ēōs), Latin Aurōra, and Baltic Aušra ("dawn", c.f. Lithuanian Aušrinė). Germanic *Austrōn- is from an extended stem *h₂ews-tro-.
The name *h₂ewsṓs is derived from a root *h₂wes / *au̯es "to shine", thus translating to "the shining one". Both the English word east and the Latin auster "south" are from a root cognate adjective *aws-t(e)ro-. Also cognate is aurum "gold", from *awso-. The name for "spring season", *wes-r- is also from the same root. The dawn goddess was also the goddess of spring, involved in the mythology of the Indo-European new year, where the dawn goddess is liberated from imprisonment by a god (reflected in the Rigveda as Indra, in Greek mythology as Dionysus and Cronus).
Besides the name most amenable to reconstruction, *h₂ewsṓs, a number of epithets of the dawn goddess may be reconstructed with some certainty. Among these is *wenos- (also an s-stem), whence Sanskrit vanas "loveliness; desire", used of Uṣas in the Rigveda, and the Latin name Venus and the Norse Vanir. The name indicates that the goddess was imagined as a beautiful nubile woman, who also had aspects of a love goddess.
The love goddess aspect was separated from the personification of dawn in a number of traditions, including Roman Venus vs. Aurora, and Greek Aphrodite vs. Eos. The name of Aphrodite Άφροδίτη may still preserve her role as a dawn goddess, etymologized as "she who shines from the foam [ocean]" (from aphros "foam" and deato "to shine"). J.P. Mallory and Douglas Q. Adams (1997) have also proposed an etymology based on the connection with the Indo-European dawn goddess, from *abhor- "very" and *dhei "to shine". Other epithets include Ἠριγόνη Erigone "early-born" in Greek.
The Italic goddess Mater Matuta "Mother Morning" has been connected to Aurora by Roman authors (Lucretius, Priscianus). Her festival, the Matralia, fell on 11 June, beginning at dawn.
The abduction and imprisonment of the dawn goddess, and her liberation by a heroic god slaying the dragon who imprisons her, is a central myth of Indo-European religion, reflected in numerous traditions. Most notably, it is the central myth of the Rigveda, a collection of hymns surrounding the Soma rituals dedicated to Indra in the new year celebrations of the early Indo-Aryans.