Such centralized ruling of lands refers to ichien chigyo (monistic ruling), and establishment of the jitouke system (the contract system where the manor's owner entrusts a jito to manage his manor and pay the customs) started in Togoku (the eastern part of Japan, particularly Kanto region).
このような一元的支配を一円知行といい、東国を中心に地頭請が行われ始めた。