The twins rebuilt the city. Romulus built the homes and baths and Remus built the temples and monuments.
Romulus wanted to name the city Rome after him, but Remus wanted to name it Rem after him. The two fought for a long time and the fight didn't end until Remus was lying dead on the ground.
Romulus ruled Rome for many years and lived till old age. He is remembered today because of all the great things he did (like killing his brother, that was a great thing) and for being the founder of what we now know as Rome.
Thanks for helping me. That would have taken hours.