Gosamaru

Gosamaru (護佐丸^?, d. 1458) 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 supported Shō Hashi, first king of the Ryukyu Kingdom, in his conquest of Hokuzan and unification of Okinawa Island. He committed suicide in 1458 during a battle with the Katsuren Aji, Amawari.

Gosamaru was born in Yamada Castle, in the village of Onna. 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. Hashi would conquer the kingdom of Nanzan to the south several years later, uniting Okinawa Island, ending the Sanzan Period, and founding the unified Ryukyu Kingdom.

In recognition of his support, Gosamaru was made custodian of Hokuzan, and given Nakijin Castle, which had until then served as the royal seat of Hokuzan. Some time later, Gosamaru left Nakijin for Zakimi, where he built Zakimi Castle; it is said he mobilized workers from as far away as the Amami Islands for this project, and that stones were moved by hand from Yamada Castle to build the new castle.

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