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'Ninigi no Mikoto' (瓊瓊杵尊) is in Japanese mythology the son of Ame no Oshihomimi no Mikoto, and grandson of Amaterasu, who sent him down to earth to plant rice there. He was the great-grandfather of Emperor Jimmu.
Amaterasu sent him to pacify Japan by bringing the three celestial gifts used by the emperor. The sword, Kusanagi, the mirror, Yata no kagami, and the jewel, Yasakani no magatama. These three gifts signify to the world that the emperor is the descendant of Amaterasu herself.
The account of Ninigi no Mikoto being sent to earth appears in the Nihon Shoki.