On the parallel-universe of Earth-One, several thousands of years ago, groups of pilgrims settled in the greater Atlantean region establishing twelve distinctive communities, a few of which evolved into modern settlements, including Tritonis. Many believe that the original twelve settlements represented the twelve signs of the Zodiac.
After the continent of Atlantis sank, the city of Tritonis survived as an isolationist settlement beneath the seas. Those who survived the cataclysm adapted to their new marine environment.
- Tritonis is the homeland of the Little Mermaid.
- Tritonis first appeared in Superman, #129 (May, 1959).
- Tritonis is named for the Olympian god of the tides, Triton, the son of Poseidon, Lord of all the sea.
- Tritonis is also the name of a salt water lake in Libya, North Africa. According to legend, this was also the home of the Haliad sea nymph, also named Tritonis.