日本武尊
Accounts in the "Kojiki" and "Nihon Shoki" are split when it comes to initial territorial expansion during Emperor Keikō's reign. In the "Kojiki", the Emperor is said to have sent his son "Prince Ōsu" (Yamato Takeru) to Kyūshū to conquer local tribes. Alternatively, the "Nihon Shoki" records that he went there himself and won battles against local tribes. Both sources agree that Keikō later sent Yamato Takeru to Izumo Province, and eastern provinces to conquer the area and spread his territory. According to traditional sources, Yamato Takeru died in the . The possessions of the dead prince were gathered together along with the sword Kusanagi; and his widow venerated his memory in a shrine at her home. Sometime later, these relics and the sacred sword were moved to the current location of the Atsuta Shrine.