In 759, Ko Gendo's party crossed through Balhae (a kingdom in northwestern Korea, also known as Bokkai or Bohai) by means of the Balhae Kingdom Way (a road) and entered Tang China in order to meet FUJIWARA no Kiyokawa.
759年、一行は藤原清河を迎えるため渤海(国)国経由(渤海路)で入唐した。