Rhea Sylvia

According to legend, she was the daughter of Numitor, king of Albalonga and descendant of Aeneas. Numitor's brother, Amulius, seized the throne and killed Numitor's son. He forced Rhea Sylvia to become a Vestal Virgin, a priestess to the goddess Vesta who is sworn to lifelong celibacy, so that Numitor would not have any heirs.

However, the god Mars took a fancy to Rhea Sylvia and raped her, conceiving the twins. When he learned of this, Amulius ordered Rhea Sylvia buried alive (the standard punishment for Vestal Virgins who did not remain celibate) and ordered a servant to kill the twins, but the merciful servant set them adrift in the river Tiber.

The name Rea Silvia suggests a minor deity, a demi-goddess of forests. Silva means woods or forest, and Rea may be related to res and regnum.

See also: Rome, Romulus, Aeneas, Mars, The founding of Rome