Case of Zhao Yang Killing Handan Wu and the Attack on the Zhao Clan by Xun Yin and Shi Jishe

In 497 BC, Zhao Yang, head of the Zhao clan, summoned his kinsman Handan Wu and executed him for failing to transfer 500 households of Wei refugees to Jinyang. Wu's son Zhao Ji and steward She Bin revolted in Handan, prompting Zhao Yang to besiege the city. Xun Yin (Zhonghang clan) and Shi Jishe (Fan clan), allies related by marriage to the Handan branch, retaliated by attacking Zhao Yang’s forces and driving him back to Jinyang. Duke Ding of Jin and the Han, Wei, and Zhi clans eventually sided with Zhao Yang, declaring the Fan and Zhonghang clans rebels. After protracted warfare, the Fan and Zhonghang clans were defeated and expelled from Jin, reducing the six noble clans to four.

The conflict was settled by military force rather than formal trial. The Duke of Jin condemned Xun Yin and Shi Jishe as rebels. Zhao Yang recovered his position and domain. The Fan and Zhonghang clans were ultimately annihilated and their territories divided among the victorious clans.

Whether Zhao Yang's execution of Handan Wu was a lawful exercise of patriarchal authority or arbitrary murder; whether the Fan and Zhonghang clans' armed intervention constituted legitimate defense of kin or treasonous rebellion; and whether the Duke of Jin's endorsement of Zhao Yang was an assertion of sovereign judgment or capitulation to the strongest clan.

Eliminated two of the six dominant clans, accelerating the disintegration of ducal authority in Jin. Marked a decisive step in the transition from aristocratic oligarchy to the eventual Partition of Jin into Han, Zhao, and Wei, reshaping the political landscape of the Spring and Autumn period.