In the period of Iemitsu TOKUGAWA, the third Shogun, three major policies were established: the establishment of a feudal system, thoroughness of national isolation, and a ban against Christianity, which forced Christians to choose either martyrdom or renunciation.
三代将軍徳川家光の時代には、封建制度の確立、鎖国の徹底、キリシタンの禁止が三大政策となり、キリスト教徒は殉教か棄教のいずれかを選択せざるを得なくなった。