one of the main Greek gods was Poseidon, he struck a rock with his Triton and created a plenitude of water. he promised there would be no drouts the people appreciated it but they moved on to the next god (some myths say it is because the water was from the sea)
another one of the main gods was Athena she stuck a seed in the in the ground and grew an olive tree. the people thought that this would be more helpful by providing a food source. as well as firewood. so they picked Athena she became patron and they named the city Athens in honour of her.