Rhea Silvia (also written as Rea Silvia), and also known as Ilia, was the mythical mother of the twins Romulus and Remus, who founded the city of Rome. Her story is told in the first book of Ab Urbe Condita of Livy and in fragments from Ennius, Annales and Fabius Pictor.
The legend 
According to Livy's account of the legend she was the daughter of Numitor, king of Alba Longa, and descended from Aeneas. Numitor's younger brother Amulius seized the throne and killed Numitor's son, then forced Rhea Silvia to become a Vestal Virgin, a priestess of the goddess Vesta. As Vestal Virgins were sworn to celibacy for a period of thirty years, this would ensure the line of Numitor had no heirs.
When Amulius learned of the birth he imprisoned Rhea Silvia and ordered a servant to kill the twins. But the servant showed mercy and set them adrift on the river Tiber, which, overflowing, left the infants in a pool by the bank. There a she-wolf (lupa), who had just lost her own cubs, suckled them. Subsequently Faustulus rescued the boys, to be raised by his wife Larentia.
Romulus and Remus went on to found Rome, overthrow Amulius, and reinstate Numitor as King of Alba Longa.
That Livy's euhemerist and realist deflation of this myth, so central to the origins of Rome, was not general is demonstrated by the recurring theme of Mars discovering Rhea Silvia – the Latinists' "invention" (to come upon) of Rhea Silvia" – in Roman arts: in bas-relief on the Casali Altar (Vatican Museums), in engraved couched glass on the Portland Vase (British Museum), or on a sarcophagus in the Palazzo Mattei.
The name Rhea Silvia suggests a minor deity, a demi-goddess of forests. Silva means woods or forest, and Rea may be related to res and regnum; Rea may also be related to Greek rheô, "flow," and thus relate to her association with the spirit of the river Tiber or Greek goddess Rhea. Carsten Niebuhr proposed that the name Rhea Silvia came from Rea, meaning guilty, and Silvia meaning of the forest and so assumed that Rhea Silvia was a generic name for the guilty woman of the forest, i.e. the woman who had been seduced there.
In Literature 
- Rhea Silvia appears as a minor goddess in Rick Riordan's fantasy novel The Mark of Athena. She and her husband Tiberinus assist demigod Annabeth Chase on her quest in Rome, Italy. She is mistaken for Audrey Hepburn.
See also 
- Ennius, Annales, I, fr. 19, as well as Cicero, Divinatio in Caecilium 1.30,
- In Fragmente der griechischen Historiker 809 f4a.
- She "declared Mars to be the father of her illegitimate offspring, either because she really imagined it to be the case, or because it was less discreditable to have committed such an offence with a god." (Livy).
- Mars' discovery of Rhea Silvia is a prototype of the "invention scene", or "discovery scene" familiar in Roman art; Greek examples are furnished by Dionysus and Ariadne or Selene and Endymion. (Noted by D. E. L. Haynes, "The Portland Vase again" The Journal of Hellenic Studies 88 (1968:58-72) p. 67; the Portland Vase features a celebrated depiction of the "invention", or coming-upon, of Rhea Sylvia by Mars.
- The she-wolf is memorialised in the Medieval bronze Capitoline Wolf, a symbol of Rome.
- Some are of the opinion that Larentia was called Lupa among the shepherds from her being a common prostitute, and hence an opening was afforded for the marvellous story (Livy).
- The theme is sometimes termed the "invention" of Rhea Silvia, in the Latin sense of "invenire", to come upon; compare the "Invention of the True Cross" by Empress Helena.
- Ovid: Amores, book III, elegy IV: 'The Flooded River'.
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