Athens

Athens is a ancient greek city that Athena and Poseidon competed for. They had to create something for the city. Poseidon created a saltwater spring for his gift, and Athena created the olive tree. The people of Athens appreciated Athena's olive tree and Athena won the contest. This is why the city is named Athens. It is only mentioned when Annabeth explains why she doesn't get along with Percy and when Percy describes Olympus.