The twins Romulus and Remus were born to a princess, Rhea, and the god of war, Mars. After the king of the place where the boys lived discovered the boys, he decided it would be best to get rid of them, so they couldn't overthrow him. He left the twins on the side of a river in a basket.
The twins were found by a she-wolf, who cared for and protected them, alongside a woodpecker, who helped them find food. Eventually they were found by a shephard, who took over the role of caring for the boys.
When the boys grew up, Remus got captured by the king, and found who he really belonged to. His brother, Romulus, then gathered up some shepherds to go and kill the king. After finding out who they were, the city offered the boys a royal position, but they turned it down to form their own city.
The twins eventually found an area for their city, but disagreed on which hill they should use. They waited for a sign from the gods(an augury), to settle the argument. They ended up seeing different signs, and it ended with the both claiming to be the winner.
Romulus impulsively built a wall around his choice of hill, Palatine hill. Remus was jealous so he made fun of the wall, and at one point even jumped over it to to show his brother wrong. This angered Romulus, and he killed his brother.
Romulus continued to work on his city, and it was founded April 21, 753 BC, and he became king. He began organizing, forming, and growing the city he named Rome. He made his army into legions, and he called his 100 most noble men Patricians. For over 1,00 years, Rome was known as one of the most powerful cities in the world.