Arima

The Arima of Hizen were a warrior house from the Arima estate in Hizen province on Kyushu. Tradition derives them from Fujiwara no Sumitomo, but they were more probably descendants of the Taira stewards of the Fujitsu estate. Arima Tsunezumi received the estate's jitō office in the early thirteenth century and took its name.

His descendant Harunobu became a Christian daimyo. In 1582 he joined Ōtomo Sōrin and Ōmura Sumitada in sending the Tenshō embassy to Europe; he later submitted to Toyotomi Hideyoshi in 1587 and kept lands around Hinoe Castle.

Harunobu kept his lands after Sekigahara but was exiled and executed in the Okamoto Daihachi affair of 1612. His son Naozumi inherited the domain; the family later moved to Maruoka in 1695, ruling there through the Edo period.