text: 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 ) .
  
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  The first emperor was named Jimmu , and was the great grandson of the Sun Goddess .