Astraea or Astrea (Ancient Greek: Ἀστραῖα; "star-maiden"), in ancient Greek religion, was a daughter of Astraeus and Eos. She was the virgin goddess of innocence and purity and is always associated with the Greek goddess of justice, Dike (daughter of Zeus and Themis and the personification of just judgement). She is not to be confused with Asteria, the goddess of the stars and the daughter of Coeus and Phoebe.
Astraea, the celestial virgin, was the last of the immortals to live with humans during the Golden Age, one of the old Greek religion's five deteriorating Ages of Man. According to Ovid, Astraea abandoned the earth during the Iron Age. Fleeing from the new wickedness of humanity, she ascended to heaven to become the constellation Virgo. The nearby constellation Libra reflected her symbolic association with Dike, who in Latin culture as Justitia is said to preside over the constellation. In the Tarot, the 8th card, Justice, with a figure of Justitia, can thus be considered related to the figure of Astraea on historical iconographic grounds.
According to legend, Astraea will one day come back to Earth, bringing with her the return of the utopian Golden Age of which she was the ambassador.
Astraea's hoped-for return was referred to in a phrase from Virgil's Eclogue IV: "Iam redit et virgo, redeunt Saturnia Regna" (Astraea returns, returns old Saturn's reign).