What is "gosamaru"

was a Ryukyuan lord ( aji) of the gusuku (castles) of Zakimi and, later, Nakagusuku. He supported Shō Hashi, first king of the Ryūkyū Kingdom, in his conquest of Hokuzan and unification of Okinawa Island.

He was also known as Seishun , and by the Chinese name Mao Guoding (毛國鼎, J: Mō Kokutei).