豐後國
Sandwiched between the powerful Amago and Ōuchi clans, Motonari led his clan by carefully balancing actions and diplomacy. Eventually, Motonari succeeded in defeating both and controlled the entire Chūgoku region. In his later years, he crushed the Ōtomo clan of Bungo Province in Kyūshū. Motonari ruled from Yoshida-Kōriyama Castle, the clan's main bastion since the early 14th century. His descendants became lords of the Chōshū Domain.