In 1213, eighteen guards of gakumonjo (three groups of six) were deployed who would play the roles of not only the guards of the gakumonjo owned by Seii Taishogun (literally, "great general who subdues the eastern barbarians") of the Kamakura bakufu MINAMOTO no Sanetomo but also fellow students.
建保元年（1213年）に鎌倉幕府征夷大将軍源実朝の学問所の警備と学友を兼ねた学問所番18名（6名ずつ3番）が設置された。