Ninigi-no-Mikoto (瓊瓊杵尊) (also 天邇岐志国邇岐志天津日高日子番能邇邇芸命;Ame-nigishi-kuni-nigishi-amatsuhiko-hiko-ho-no-ninigi-no-Mikoto) is, in Japanese mythology, the son of Ame no Oshihomimi no Mikoto and Takuhadachiji hime no Mikoto (栲幡千千姫命), and grandson of Amaterasu, who sent him down to earth (tenson kōrin) to plant rice there. He was the great-grandfather of Emperor Jimmu. His wife was Konohanasakuya-hime. His name also appears as Ninigi (瓊瓊杵).

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 that the emperor is the descendant of Amaterasu herself. The account of Ninigi no Mikoto being sent to earth appears in the Nihon Shoki.

From Wikipedia
https://en.wikipedia.org/wiki/Ninigi-...