Satto

Satto (察度) (c. 1320 – 1395), also known as Chadu, was a king of Chūzan, one of three kingdoms formerly on the island of Okinawa. His reign was marked by expansion and development of Chūzan's trade relations with other states, and the beginning of Okinawa's tributary relations with Ming Dynasty China, a relationship that continued for roughly five hundred years, almost until the fall of the Qing Dynasty.