The uncle of the twin named Amulius tried to kill the twin, to take the throne from their grandfather. He threw the twin in the nearby river together at midnight to get rid of them.
A she-wolf saw a twin baby near the river and the wolf adopted the twin and give them her own milk.
As the twin grew older, an old man saw them running around the land so a farmer named Fastulus adopted the twin.
After knowing that they're Romulus and Remus, they went to fight their uncle(Amulius) and give the throne back to their grandfather. Then, they decided to build a city, but they disagree to each other so they build a wall to protect their own city.
Remus jokes around Romulus's city wall by coming in the city easily and make fun of how easy he can come into the city.Romulus got angry at Remus and they start to fight, and after a long fight Remus died apparently.
When Romulus killed Remus, Romulus named the city Rome and he was the first king of the Roman Empire at 753 BC.