<human>:  Is Poseidon similar to the god Vulcan?
<bot>: No, Poseidon is not similar to the god Vulcan. Poseidon is the Greek god of the sea, earthquakes and horses. He is not similar to the god Vulcan. Vulcan is the Roman god of fire. Hephaestus is the Greek god of fire. Hephaestus's ROman equivalent is Vulcan, the Roman god of fire, so they are not similar.