Shō Shin
Furusutobaru Castle is best known as the residence of Oyake Akahachi. Through charisma, he managed to convince the other chieftains and lords of the Yaeyama Islands to follow him, then declared that Yaeyama would not pay tribute to the Ryukyu Kingdom. He then proposed an invasion of Miyako Island, which, after hearing of these plans, Nakasone Toyomiya of Miyako then led a preemptive invasion of Yaeyama. Miyako's forces landed in Miyara Bay and attacked Furusutobaru Castle in 1500. Nakasone would go on to conquer the rest of Yaeyama and then submitted to King Shō Shin when faced with the Ryukyuan army.