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After the death of Guan Zhong, Duke Huan of Qi – once the undisputed hegemon of the Spring and Autumn period – grew indulgent and neglected state affairs. With his passing, Qi’s dominance crumbled, leaving a power vacuum.
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When news reached the state of Lu that Duke Huan of Qi had appointed Guan Zhong – once a prisoner of Lu – as his chancellor, Duke Zhuang of Lu was furious.