One day, while minding their own business, they went across the shepherds of King Amulius and a fight started regarding their herd which led to Remus’s capture. Romulus found it was unfair what, he incited local shepherds to raid King Amulius’s place and rescue his brother.
They succeeded and even killed King Amulius in the process. The people then offered the crown to both Remus and Romulus but they refused and said they want to build their own cities themselves.
Together they found a good spot but they had a different idea of which hill to start the city from. Romulus wanted the Palatine Hill while Remus preferred Aventine Hill. Regardless, Romulus went ahead and started building a wall around Palatine Hill.
Annoyed at this, Remus started making fun of Romulus’s wall constantly over and over. Until one day, Remus jumped over the wall saying the wall is useless and this was the final line for Romulus.
Romulus snapped, threw the first punch and being aggressive, he accidentally killed Remus. So with Remus out of the picture, he continued building his city and called it Rome after himself.