Initially, Sadayo IMAGAWA (Ryoshun), who had been ordered to subdue Nancho powers such as Imperial Prince Kanenaga, assumed the position, but the Bakufu feared that Ryoshun would establish his own power in Kyushu; after Ryoshun was dismissed, descendants of the Shibukawa clan succeeded in the position.
初めは懐良親王ら南朝勢力の討伐に任じられた今川貞世（了俊）が就くが、了俊が九州で独自の勢力を築くと幕府に警戒され、了俊が解任された後は渋川氏の世襲となる。