Side by sideParallel across traditions
Both are rulers of the sea with underwater palaces and control over storms and marine life.
| Poseidon | Ryujin | |
|---|---|---|
| Tradition | Greek Pantheon | Japanese Pantheon |
| Domains | sea, earthquakes, horses, storms | sea, ocean, dragons, storms, rain |
| Symbols | trident, horse, dolphin, bull | dragon, tide jewels, coral palace, sea turtle |
| Also called | Neptune | Watatsumi, Owatatsumi-no-kami, Dragon King of the Sea |
Both are associated with sea and storms.
Associated with earthquakes and horses.
Associated with ocean, dragons, and rain.
Horses, earthquakes, and the drowned coast are his working signs. Isthmia held games under his name. A bull often went to the sea. Inland Boeotia kept him as a horse god, not only a sailor's patron.
Tide jewels and the undersea palace. Fishermen more than courtiers. The cult is the weather of the catch.
Greek Pantheon
God of the sea, earthquakes, and horses. Brother of Zeus and Hades, ruler of the oceans and all waters.
Poseidon rules the vast oceans, earthquakes ("Earth-Shaker"), and horses. He is a moody and tempestuous god, much like the sea itself. Sailors prayed to him for safe passage, often sacrificing horses or bulls to appease his wrath.
Japanese Pantheon
Dragon god of the sea who dwells in an underwater palace made of red and white coral. Ruler of all sea creatures and controller of the tides through his magical tide jewels.
Ryujin emerged as a kami of the ocean depths in early Shinto belief. According to the **Kojiki**, he is the father of **Toyotama-hime**, who married the hunter Hoori and became grandmother to Japan's first emperor Jimmu. His coral palace **Ryugu-jo** lies beneath the waves, where time flows differently than on land.
**Ryujin** (also called Watatsumi) is the dragon deity who rules the ocean from his magnificent coral palace **Ryugu-jo** beneath the waves. He commands all sea creatures: fish, turtles, jellyfish, and other marine life serve as his messengers and attendants. His kingdom exists in a realm where time moves differently; what seems like days underwater may be centuries on the surface.
Comparisons pair figures that play a similar role across traditions, or that the myths connect within one. A shared role does not, by itself, establish a shared origin.