Nearly every town in ancient Greece had a god that looked after the townspeople. Towns rarely had more than one god to keep an eye on their best interests. Most gods did not share well. So only one god was allowed to look over the city.
One Day, a new town has opened up right by the water. Athena and Posiden both wanted this city because Posiden is the god of the sea and Athena is the goddess of wisdom and she really wanted this town. Even though Posiden is Athena uncle they were not backing down for wanting this town.
The town were to decide who they wanted to be there god.