However, in around the end of the 14th century, the shugo-shiki was exclusively possessed by a certain clan that inherited the post of its province, which was called "monopolization of the shugo-shiki."
しかし、14世紀末ごろになると、一定の氏族がその国の守護職を相伝（世襲）するという守護職の固定化が見られるようになっていた。