Overview
Poseidon is the name of a DC Comics deity who is based on the Greek god of the same name. Due to his status as Greek god of the sea, the character has figured primarily in stories relating to two of DC Comics' main superhero properties: Wonder Woman (an Amazon warrior with various connections to the Greek pantheon) and Aquaman (the king of the underwater city of Atlantis).
Publication history
Poseidon first appears in Flash Comics #9 and was adapted by George Pérez.
Fictional character biography
Poseidon's history in Greek mythology is the same in the DC Comics universe, including the fact that he's the brother of Zeus and Hades.
When the Amazons freed themselves from enslavement arranged in part by Ares, the founding Goddesses of that people received the help of Poseidon, who had a deep grievance against the war god, to get the Amazons to safety by parting the sea waters to create a path to the island of Themyscira.
From Wikipedia (CC BY-SA 4.0).