Athena and Poseidon. To find out more about the contest between Athena and Poseidon, see this Wikipedia article: link; for information about the image: image source.
You can see the rival gods Athena and Poseidon facing off here - Athena has her owl, of course, and Poseidon can be recognized his trident. Meanwhile, be sure to notice the female Sphinx on the pillar between them - quite an image! You can find out more about this Etruscan vase painting at this informative Louvre webpage.
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.
