Titus Livius (Livy), The History of Rome, Book 1
Rev. Canon Roberts, Ed.

4. But¹ the Fates had, I believe, already decreed the origin of this great city and the foundation of the mightiest empire under heaven. [2] The Vestal was forcibly violated and gave birth to twins. She named Mars as their father, either because she really believed it, or because the fault might appear less heinous if a deity were the cause of it. [3] But neither gods nor men sheltered her or her babes from the king's cruelty; the priestess was thrown into prison, the boys were ordered to be thrown into the river. [4] By a heaven-sent chance it happened that the Tiber was then overflowing its banks, and stretches of standing water prevented any approach to the main channel. Those who were carrying the children expected that this stagnant water would be sufficient to drown them, so under the impression that they were carrying out the king's orders they [5??] exposed the boys at the nearest point of the overflow, where the Ficus Ruminalis (said to have been formerly called Romularis) now stands. The locality was then a wild solitude. [6] The tradition goes on to say that after the floating cradle in which the boys had been exposed had been left by the retreating water on dry land, a thirsty she-wolf from the surrounding hills, attracted by the crying of the children, came to them, gave them her teats to suck and was so gentle towards them that the king's flock-master found her licking the boys with her tongue. According to the story his name was Faustulus. [7] He took the children to his hut and gave them to his wife Larentia to bring up. Some writers think that Larentia, from her unchaste life, had got the nickname of ‘She-wolf’ amongst the shepherds, and that this was the origin of the marvellous story.

[8] As soon as the boys, thus born and thus brought up, grew to be young men they did not neglect their pastoral duties but their special delight was roaming through the woods on hunting expeditions. [9] As their strength and courage were thus developed, they used not only to lie in wait for fierce beasts of prey, but they even attacked brigands when loaded with plunder. They distributed what they took amongst the shepherds, with whom, surrounded by a continually increasing body of young men, they associated themselves in their serious undertakings and in their sports and pastimes.