Yamata no Orochi (八岐の大蛇?, lit. "8-branched giant snake") or Orochi, translated as the Eight-Forked Serpent in English, is a legendary 8-headed and 8-tailed Japanese dragon that was slain by the Shinto storm-god Susanoo.
Read more about Yamata No Orochi: Mythology, Etymology, Mythological Parallels, In Popular Culture