Japan carried out rigorous diplomatic missions to Balhae, which had been established in 713 mainly by the Makkatsu tribe and people from former Goguryeo(狛族) in the north-eastern area of China.
713年、靺鞨族や旧高句麗人（狛族）を中心に中国東北部に建国された渤海(国)とは緊密な使節の往来がおこなわれた。