In Japanese mythology, the tide jewels-- individually, the kanju (痌?, lit. '(tide-)ebbing jewel') and manju (?痌?, lit. '(tide-)flowing jewel')-- were magical gems that the Sea God used to control the tides. Classical Japanese history texts record an ancient myth that the ocean kami Watatsumi  'sea god' or Ry?jin 纒 'dragon god' presented the kanju and manju to his demigod son-in-law Hoori, and a later legend that Empress Jing? used the tide jewels to conquer Korea. The fable of Tamatori-hime ド? 'Princess Jewel Taker', which was a favorite ukiyo-e subject of Utagawa Kuniyoshi, is a variation of the Hoori and Toyatama-hime love story. Tamatori was supposedly an ama diver who married Fujiwara no Fuhito and recovered a precious jewel that the Sea God stole.