It was around the time from the fall of the Kamakura bakufu (Japanese feudal government headed by a shogun) to the period of the Northern and Southern Courts (Japan), and especially after the Kanno Disturbance, that this class of samurai became significant.
この層の武士たちが重要な存在となったのは鎌倉幕府滅亡の前後から南北朝時代にかけてで、特に観応の擾乱の頃からである。