Sai On
The "Chūzan Seikan" seems to follow Okinawa's own tradition. Sai Taku "corrected" the Chūzan Seikan with Chinese records which stated that Shō Shishō, Crown Prince of Chūzan, reported the death of "his father" Bunei. Sai On's drastic revision was also based on Chinese records. The last diplomatic contact of Nanzan was of 1429 while that of Hokuzan was of 1416. From these records, Sai On naïvely inferred that these two polities ceased to exist immediately after the last contacts.