Facts about Poseidon Poseidon was most notably the God of the sea and the protector of all waters; sailors relied upon him for safe passage. Poseidon was allotted his dominion after the fall of the Titans. Zeus and Hades were his brothers. It stands to reason that, because of his influence on the waters, he was worshipped in connection with navigation. More items...Does Poseidon rule over all the sea gods?
Poseidon rules over all bodies of water, with the ability to create earthquakes and storms to cause devastation to his enemies and those who go against him. Among all other Greek gods, Poseidon is considered to be on par in terms of power with Zeus, the king of gods.