Sai On
Okinawa's own narratives on the Sanzan period were recorded centuries later by Ryūkyū. Major history books include the "Chūzan Seikan" (1650), Sai Taku's edition of the "Chūzan Seifu" (1701), Sai On's revised edition of the "Chūzan Seifu" (from 1724 onwards) and the "Kyūyō" (1745). They reflect Okinawa's historical tradition to some degree. They are, however, desperate attempts to reconcile conflicting sources. Sai On, in particular, extensively rewrote his father's edition of the "Chūzan Seifu" using newly obtained Chinese sources. As a result, he damaged its historical value, from modern historians' perspective. Additionally, the "Omoro Sōshi" (1623) is helpful in understanding Okinawa's own world-view although it is a compilation of poems and by no means a history book.