Ryujin- Japanese GodDeity"Dragon King of the Sea"

Origins in the Kojiki

The Kojiki records the birth of the Watatsumi kami during Izanagi's purification after his flight from Yomi. When Izanagi washed himself in the river at Tachibana in Hyūga, kami emerged at each depth: Sokotsuwatatsumi from the bottom of the water, Nakatsuwatatsumi from the middle, and Uwatsuwatatsumi from the surface. These three sea gods, born from the same act of purification that produced Amaterasu, Tsukuyomi, and Susanoo, reflect the ocean's layered depths. Later tradition collapsed this triad into the singular figure of Ōwatatsumi, the supreme lord of the sea.

The name Ryūjin, "Dragon God," arrived with Buddhism. Chinese scripture spoke of four Lóngwáng who ruled the seas at each compass point, serpentine beings who shifted between dragon and human form, commanding tides and rain from palaces of coral. Japanese worshippers recognized their own Watatsumi in these dragon kings. Over centuries the two merged: the kami who was born when Izanagi washed in the river became also the dragon who coils beneath the ocean floor.

The Coral Palace

Ryūjin's palace, Ryūgū-jō, lies deep beneath the waves, a structure of red and white coral, crystal, and precious gems, its walls glowing with an inner light that renders the dark ocean luminous. Jeweled gates open onto gardens of sea anemone and waving kelp, where pearls grow like fruit on coral branches. The palace contains four wings, each holding a different season: visitors can step from eternal spring into summer, from autumn into winter, simply by crossing a threshold. Fish, turtles, octopi, and other marine creatures serve as courtiers and attendants, some in human form, others in their natural shapes. Time moves differently within its walls. Days spent in Ryūgū-jō may equal years, decades, or even centuries in the world above.

Hoori and the Lost Fishhook

The Kojiki and Nihon Shoki tell how Hoori, a grandson of Amaterasu and son of Ninigi, quarreled with his elder brother Hoderi. The brothers had exchanged tools, Hoderi's fishhook for Hoori's hunting bow, but Hoori lost the fishhook in the sea. Hoderi demanded its return, refusing any substitute, and Hoori despaired.

On the advice of the salt god Shiotsuchi, Hoori descended to the ocean floor and came to Ryūgū-jō. There he sat by a well near the palace gate. When Ryūjin's daughter Toyotama-hime came to draw water, she found the handsome young god and fell in love at first sight. Ryūjin welcomed Hoori as a guest and gave him Toyotama-hime in marriage. For three years Hoori lived in the Dragon Palace, feasting and at ease, though only days seemed to pass.

When Hoori remembered his quarrel and asked about the lost fishhook, Ryūjin summoned all the fish of the sea. The tai (sea bream) was found to have the hook stuck in its throat. The dragon king returned the hook to Hoori and gave him his greatest treasures: the Tide Jewels. Kanju, the jewel of the ebbing tide, and Manju, the jewel of the flowing tide. With these, Ryūjin instructed, Hoori could control the ocean itself. If his brother attacked, he should raise the tide to drown him; if his brother begged for mercy, he should lower it.

Hoori returned to the surface, used the jewels exactly as instructed, and brought Hoderi to submission. Through this victory the line of Hoori was established as supreme, leading directly to Emperor Jimmu, the legendary founder of the Japanese imperial dynasty. The imperial house thus claims descent not only from Amaterasu but from Ryūjin himself.

Toyotama-hime's Farewell

When Toyotama-hime became pregnant, she left the Dragon Palace to give birth on land, as was proper for a child who would rule the earthly realm. She built a birthing hut thatched with cormorant feathers on the seashore and made Hoori promise not to look inside while she labored.

Hoori broke his promise. Peering through the thatch, he saw not his beautiful wife but a massive wani, a dragon or sea creature, writhing in the agony of childbirth. Toyotama-hime, shamed beyond recovery at being seen in her true form, abandoned her newborn son and returned to the sea, sealing the path between Ryūgū-jō and the human world forever. She sent her younger sister Tamayori-hime to nurse the infant, who was named Ugayafukiaezu. Tamayori-hime later married her nephew, and their son was Jimmu, binding the dragon bloodline twice over into the imperial house.

The Tide Jewels and Empress Jingū

The Tide Jewels given to Hoori reappear in the Nihon Shoki's account of Empress Jingū's legendary campaign across the sea. As the enemy fleet approached, she cast Kanju into the water, and the ocean receded, stranding the opposing ships on exposed seabed. When the enemy soldiers climbed down to attack on foot, she cast Manju, and the sea surged back with overwhelming force, drowning them all.

Urashima Tarō

Ryūjin's palace enters folk memory through Urashima Tarō, a fisherman who rescued a sea turtle from cruel children. The turtle, actually the dragon king's daughter in disguise, invited him to Ryūgū-jō as thanks. Urashima spent what seemed like three days in paradise, entertained by the princess amid the seasonal wings of the palace, the fish-courtiers performing dances and songs around him.

When homesickness drew him back to the surface, the princess gave him a jeweled box called tamatebako, warning him never to open it. Urashima returned to find that three hundred years had passed. His village was unrecognizable, everyone he had known was long dead. In despair, he opened the box. White smoke billowed out, and Urashima aged three centuries in an instant, his borrowed youth vanishing as time caught up with him at last. In the Tango no Kuni Fudoki version, a crane rises from the smoke: Urashima transformed, released from the mortal body he had briefly reclaimed.

The Dragon and Rain

In Japanese folk belief, dragons dwell not only in the ocean but in any body of water deep enough to conceal them: lakes, rivers, waterfalls, sacred pools. As masters of water in all its forms, they control the rains that determine whether rice crops thrive or fail. During droughts, communities would gather at dragon shrines or lakeside sanctuaries and cast offerings into the water, rice, sake, even horses, to petition the dragon king to release rain.

Records from the Heian period describe monks performing rain rites at Shinsen'en garden in Kyoto. Kūkai stood at the water's edge and chanted sutras until a dragon rose from the pond and the sky darkened. The rain fell before he finished.