・Kamafuta Castle was constructed by Chijiwa Yamato-no-kami Naokazu in 1569.
・In 1577, Ryuzoji Takanobu invaded Shimabara Peninsula. When Kamafuta Castle was defeated, the lord of the castle Chijiwa Naokazu committed suicide.
・Chijiwa Seizaemon Naokazu (Chijiwa Miguel), one of the members of the Tensho embassy to Europe, was the son of Chijiwa Yamato-no-kami Naokazu, the lord of Kamafuta Castle.