After Amulius instructed his servant to drown the babies and reluctantly he put them in the river to drown. These babies were Romulus and Remus
They were luckily found by a she-wolf who suckled them and saved them from drowning.
The she-wolf took the babies back to her cave where she raised and suckled them.
Eventually a shepherd stumbles by the cave and saw the babies. He then raised the babies as his own.
The boys grew up as Romulus and Remus. They wanted to found a city buy argued over which hill to build it on. They wanted a sign from the gods. Remus say six vultures first but Romulus had seen 12. Both thought they won so they started building their own cities.
Then Remus made fun of Romulus's walls as he was jealous. This made Romulus very angry so he killed his brother. He then proceeded to found Rome and become its first king.