Poesidon is the olympian greek god of the sea, and is named the earth shaker because of his earthquakes, and is also the lord of horses. Named one of the god in the big three, Zeus,Poseidon, and Hades.
So....
Poesidon and athen vied control over athens, and its surrounding territory, attica. they will have a contest of who should have control over the land for the people to decide.
But
so poseidon took his trident and zaped a rock...
unfortunally...
And made a living thing that is called a horse, who can help you in battle.
Athena made a olive tree that olive was fundamental to the greek economy can also get money.
The Athenians voted for athena because of what it can do to the econmy, but it angered Poseidon and he cursed Athens with a lot of earth quakes and also crused them when they were on sea.