Tamagusuku, King of Chūzan, was succeeded by King Seii. After Seii's death, people deposed the crown prince and enthroned Satto, the ruler of Urasoe, in 1350. Although his existence was supported by contemporary sources, his life is colored by mythology: he was a son of a humble farmer and a swan maiden. During his reign, he started to pay tribute to Ming China. Also, he received tribute from the southern island groups of Miyako and Yaeyama for the first time in history. Satto was succeeded by his son Bunei in 1395.
