Difference between Neptune and Poseidon
Roman Sea God Neptune
When hearing the names Neptune or Poseidon, many people conjure up the same image, that of a sea or water god and the horses, and always with a trident. And indeed, they are both sea gods, however, whether or not they are the same god is up for debate.
Many believe that the Romans simply adopted the Greek god Poseidon and changed his name to Neptune. However, even if they are referencing the same god, their depictions are different in several key aspects (despite the fact that in art they frequently look very similar).