Gosamaru

was a Ryukyuan Lord (Aji) of Yomitanzan and, later, Nakagusuku. He was also known as Seishun (盛春), and by the Chinese name Mao Guoding (毛國鼎, J: Mō Kokutei). He succeed his father as the Aji of Yomitanzan, and in 1416 he led the forces of Yomitanzan in support of Shō Hashi, king of the Okinawan kingdom of Chūzan, in his invasion and conquest of the neighboring kingdom of Hokuzan. In 1458, however, Amawari reported to the king that it was Gosamaru who was planning a revolt, An alternate theory claims that the entire affair was organized by the royal government, in order to remove both Gosamaru and Amawari as powerful rivals and potential threats to the succession.

In popular culture The tale of Gosamaru's betrayal and destruction by Amawari is among the more famous and popular of local historical legends. A Kumi odori (narrative dance-play) telling of Gosamaru's sons' quest for revenge against Amawari, was once performed as part of the kingdom's formal entertainment of Chinese investiture envoys to Ryukyu, and has in more recent times become popular again. Another version of events where Gosamaru plotted to take over the kingdom and was jealous of Amawari's growing power is presented in the play titled "Amawari."