This painting by the "Amasis Painter" (you can see where it says AMASIS MEPOIESEN, "Amasis Made Me") shows Athena and Poseidon. In a famous incident, the two gods competed for the favor of the people of Athens; the city did not yet have a divine patron. Athena won the contest by giving the people an olive tree and so the city is known as Athens even now.
You can also find more myths and legends for the week of September 23 - September 29 here. For more information and links to the actual javascript code, see the Myths & Legends Widget Reference Page.