Stories of ancestry and parentage

Amulius forces Rhea Silvia to perpetual virginity as a Vestal priestess, but she bears children anyway. In one variation of the story, Mars, god of war, seduces and impregnates her: in another, Amulius himself seduces her, and in yet another, Hercules.
The king sees his niece's pregnancy and confines her. She gives birth to twin boys of remarkable beauty; her uncle orders her death and theirs. One account holds that he has Rhea buried alive – the standard punishment for Vestal Virgins who violated their vow of celibacy – and orders the death of the twins by exposure; both means would avoid his direct blood-guilt. In another, he has Rhea and her twins thrown into the River Tiber.
In every version, a servant is charged with the deed of killing the twins, but cannot bring himself to harm them. He places them in a basket and leaves it on the banks of the Tiber. The river rises in flood and carries the twins downstream, unharmed.[17]


Altar from Ostia showing the discovery of Romulus and Remus (now at the Palazzo Massimo alle Terme).
The river deity Tiberinus makes the basket catch in the roots of a fig tree that grows in the Velabrum swamp at the base of the Palatine Hill. The twins are found and suckled by a she-wolf (Lupa) and fed by a woodpecker (Picus). A shepherd of Amulius named Faustulus discovers them and takes them to his hut, where he and his wife Acca Larentia raise them as their own children.


Faustulus (to the right of picture) discovers Romulus and Remus with the she-wolf and woodpecker. Their mother Rhea Silvia and the river-god Tiberinus witness the moment. Painting by Peter Paul Rubens, c. 1616 (Capitoline Museums).
In another variant, Hercules impregnates Acca Larentia and marries her off to the shepherd Faustulus. She has twelve sons; when one of them dies, Romulus takes his place to found the priestly college of Arval brothers Fratres Arvales. Acca Larentia is therefore identified with the Arval goddess Dea Dia, who is served by the Arvals. In later Republican religious tradition, a Quirinal priest (flamen) impersonated Romulus (by then deified as Quirinus) to perform funerary rites for his foster mother (identified as Dia).
Another and probably late tradition has Acca Larentia as a sacred prostitute (one of many Roman slangs for prostitute was lupa (she-wolf).[18][19]
Yet another tradition relates that Romulus and Remus are nursed by the Wolf-Goddess Lupa or Luperca in her cave-lair (lupercal). Luperca was given cult for her protection of sheep from wolves and her spouse was the Wolf-and-Shepherd-God Lupercus, who brought fertility to the flocks. She has been identified with Acca Larentia.