 At the same time, Iechika moved his headquarters from Tsurukubi Castle to Matsuyama Castle, entrusting the former fortification to his senior vassal Mimura Chikanari.In 1566, while holding a council with his senior retainers at Kōzenji Temple, Iechika was shot to death by Endō Matajirō and Yoshijirō, two brothers who had received orders from Ukita Naoie.It was an uncommon killing, as gun assassinations were still rare at the time.