Matsuyama Castle
However, issues began to arise with the Shō family, and so Iechika turned to Mōri Motonari for support. The Mōri clan came to Iechika's aid, and assisted in largely subduing the province under the Mimura. At the same time, Iechika moved his headquarters from Tsurukubi Castle to Matsuyama Castle, entrusting the former fortification to his senior vassal Mimura Chikanari.