In the Sengoku Period, the Akamatsu clan became deteriorated through the internal conflicts; Masanori's son, Yoshimura AKAMATSU was killed by his own retainer Muramune URAGAMI, and in addition, Muramune utilized Yoshimura's son Harumasa AKAMATSU to set up a puppet administration.
戦国時代(日本)に入ると、政則の子・赤松義村が家臣の浦上村宗に殺されさらにその子・赤松晴政は村宗に傀儡として擁立されるなどして赤松氏は内紛により衰退していく。