Shinbutsu-shūgō, the syncretism of Buddhism and native kami worship 「庚戌。遣使奉渤海信物於諸國名神社。」 「我滅度後、於末法中、現大明神、広度衆生。」 Hori, Ichirō (1970). "Three Types of Redemption...

and Yoo Deuk-gong established a personal view on the history of Balhae (渤海), founded by migrants from Goguryeo. Their approach to studying and compiling...