Once upon a time, Mars, the Roman god of war married Rhea Silvia, the daughter of King Numitor. The had two twin sons named Romulus & Remus.
I'll look after you boys now...
Other deities wanted to harm the boys & Mars so Rhea put the twins in a basket and set them down the Tiber River. She did this so that they were protected and hoped that someone would look after them.
We are the sons of the god of war and we must start our own city, here by the Tiber River.
A she-wolf rescued the twins & cared for them by feeding them with her own milk.
I, Romulus, the son of the god of war, rule here - as the king of Rome!
Finally a shepherd, called Faustulus, found them & raised them with the help of his wife.
The boys figured out who they really were one day and decided to build a city on the banks of the Tiber River, where they had been found by the wolf & set adrift by their real mother.
The two brothers fought & argued as they both wanted to be the sole king of their city. Romulus killed Remus with a rock and therefore the city is named after him, Rome.