Five centuries later , Japan 's own Kojiki and Nihon-shoki chronicles describe the creation of the imperial dynasty in the year 660 b.c. : the first emperor , Jimmu ( Divine Warrior ) great grandson of the Sun Goddess 's grandson embarked on an expedition of conquest from Kyushu along the Inland Sea coast to the Yamato plain of the Kinki region ( near modern-day Nara ) .
The emperor Jimmu faced many great resistances during his conquest from Kyushu to the Yamato plains .