Rhea Silvia
The Tiber River that flows through Rome gets its name from Tiberinus.  He married Rhea Silvia while the twins, Romulus and Remus, were raised by a she-wolf. When the babies were a few months old, a cowherd found them and raised them. When they were adults, they decided to build a city together.  But they realized only one of them could be its king.  The two men waited on opposite hills for an omen while their followers watched.  At first, six vultures landed on the hill where Remus was waiting.  The followers believed this would mean the city would last for six hundred years.   But then twelve vultures landed on Romulus' hill and they named the city after him instead.  Shortly afterword, Remus made fun of the city wall Romulus was building.  Either one of Romulus' friends or Romulus himself hit Remus, and he died. The city was named after Romulus, Rome.