Arima Tsunezumi

Arima Tsunezumi was an early Kamakura-period warrior and the recorded founder of the Hizen-Arima clan. During the Kenpo era of 1213 to 1219 he was granted the jitō office of the Arima manor in Hizen Province and took the surname Arima.

During the same era he built Hinoe Castle on the Shimabara Peninsula. Clan tradition called him a descendant of the Heian pirate leader Fujiwara no Sumitomo.