The Temple of Poseidon is an ancient Greek temple on Cape Sounion, Greece, dedicated to the god Poseidon. There is evidence of the establishment of sanctuaries on the cape from as early as the 11th century B.C. Sounion’s most prominent temples, the Temple of Athena and the Temple of Poseidon, are however not believed to have been built until about 700 B.C., and their kouroi (freestanding Greek statues of young men) date from about one hundred years later. The material and size of the offerings at the Temple of Poseidon indicate that it was likely frequented by members of the elite and the aristocratic class.
The Greeks considered Poseidon to be the "master of the sea"