In a maritime country like Greece, the god of the sea was bound to occupy a high position in the divine hierarchy. In power, Poseidon was considered second only to Zeus (Jupiter), the supreme god himself. His implacable wrath, manifested in the form of storms, was greatly feared by all mariners. In an age without mechanical power, storms very frequently resulted in shipwrecks and drownings.
The temple at Cape Sounion, Attica, therefore, was a venue where mariners, and also entire cities or states, could propitiate Poseidon, by making animal sacrifice, or leaving gifts.