Duke Huan of Qi
Guan Zhong was disparagingly identified with the Legalist school as a result of his administrative reforms. Though actually legalistic philosophy did not develop until hundreds of years later, R. Eno of Indiana University does consider that "If one were to trace the origins of Legalism as far back as possible, it might be appropriate to date its beginnings to the prime ministership of Guan Zhong, chief aide to the first of the hegemonic lords of the Spring Autumn period, Duke Huan of Qi (r. 685–643)."