Poseidon's Face Recreation (about 3 1/2 by 2 inches, resin cast). Poseidon (Greek: Ποσειδῶν) is one of the twelve Olympian deities of the pantheon in Greek mythology. His main domain is the ocean, and he is called the "God of the Sea". Additionally, he is referred to as "Earth-Shaker" due to his role in causing earthquakes (Wikipedia).