Ninigi-no-Mikoto is a significant figure in Japanese mythology, known as the grandson of the sun goddess Amaterasu. He is often associated with the descent of deities to Earth, tasked with bringing agriculture and civilization to the Japanese people. His arrival is marked by the establishment of the imperial lineage. Ninigi is also linked to the sacred treasures of Japan, which include the Yasakani no Magatama, Kusanagi no Tsurugi, and Ame-no-Murakumo no Tsurugi. These treasures symbolize the legitimacy and divine right of the Japanese emperors, connecting them to the divine heritage of Amaterasu.