Shō Hashi
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.