The fundamental lord and vassal structure of the Kamakura bakufu (Japanese feudal government headed by a shogun) was formed through obligation performed by Kamakura-dono (lord of Kamakura) who was a toryo (head of samurai clan) corresponding to seii taishogun to gokenin (an immediate vassal of the shogunate during the Kamakura and Muromachi through Edo periods), and service performed by gokenin to Kamakura-dono.
鎌倉幕府の基本的な主従制構造は、武家の棟梁である鎌倉殿（≒征夷大将軍）と御家人との御恩と奉公の関係により成り立っていた。