In the Kamakura period, there were many cases where shugo (provincial constable) seized power of kokuga instead of provincial governors, and as a result, the Kamakura bakufu (Japanese feudal government headed by a shogun) also started to impose ikkoku heikinyaku taxes and tasks.
鎌倉時代には、国司に代わって守護が国衙を掌握するケースが多くなり、鎌倉幕府による一国平均役の賦課も行われるようになった。