The second sense appears to have been imported from the earlier governmental thought of "legalist" Shen Buhai (400 BC – c. 337 BC) as Taoists became more interested in the exercise of power by the ruler. Called "rule by non-activity" and strongly advocated by Han Fei, during the Han dynasty, up until the reign of Han Wudi rulers confined their activity "chiefly to the appointment and dismissal of his high officials", a plainly "Legalist" practice inherited from the Qin dynasty. This "conception of the ruler's role as a supreme arbiter, who keeps the essential power firmly in his grasp" while leaving details to ministers, has a "deep influence on the theory and practice of Chinese monarchy", and played a "crucial role in the promotion of the autocratic tradition of the Chinese polity", ensuring the ruler's power and the stability of the polity.