One view is that the Go-on (obligation) and Hoko (duty) -based Hoken system was completed with the establishment of the Kamakura bakufu (Japanese feudal government headed by a shogun), and this view has been adopted in most introductory books since prewar periods.
鎌倉幕府の成立によって御恩と奉公からなる封建制が成立したとする説で、戦前以来、ほとんどの概説書で採用されていた。