From the Kamakura period to the Muromachi period, it is thought that over 100 feudal clans existed. Also exerting great influence during this time was a samurai clan operating along the Genkai Sea called the Matsuratō. Upon entering the Sengoku period, the Ryūzōji clan expanded their control to include all of Hizen and Chikugo Provinces, and part of Higo and Chikuzen Provinces. After the death of "daimyō" Takanobu Ryūzōji, Naoshige Nabeshima took control of the political situation, and by 1607 all of the Ryūzōji clan's domain was under the control of the Nabeshima clan.