The Case of the Cockfight between Ji Pingzi and Hou Zhaobo and Duke Zhao's Attack on the Ji Clan

In 517 BC, during the Spring and Autumn period, a trivial cockfight between Ji Pingzi, chief of the powerful Ji clan, and Hou Zhaobo escalated into a major political crisis. Hou accused Ji of cheating by applying mustard to his rooster's feathers and sought justice from Duke Zhao. The duke, long resentful of the Three Huan clans' dominance, seized the opportunity to ally with Hou and the Zang clan, launching a military assault on the Ji residence. Ji Pingzi was besieged and pleaded for exile or investigation, but Duke Zhao refused. The Shusun and Mengsun clans, fearing the destruction of the Ji would upset the balance of power and threaten their own survival, jointly counterattacked. The ducal forces were routed, and Duke Zhao fled to Qi and later to Jin, never returning to Lu. Ji Pingzi assumed full control of the state apparatus, and the duke died in exile eight years later.

There was no formal judicial verdict. The immediate outcome was a military victory for the Three Huan clans. Duke Zhao was deposed and exiled; Ji Pingzi acted as de facto ruler, and the ducal throne remained vacant until Duke Zhao's death, after which his younger brother was installed as Duke Ding under the clans' control.

The core dispute was whether the sovereign had the right to unilaterally exterminate a senior ministerial clan without due process, and whether the Ji clan's entrenched power constituted a usurpation of ducal authority. The cockfight was merely a pretext for the deeper constitutional struggle between the weakened ducal house and the ascendant aristocratic oligarchy.

The incident epitomized the collapse of the Zhou feudal order, where "the rites and music were lost" and subordinate ministers usurped princely power. It entrenched the hereditary rule of the Three Huan over Lu, marginalizing the legitimate duke. Confucius, a contemporary, later condemned the breakdown of propriety, and the case became a classic example of how personal vendettas among aristocrats could topple a sovereign. It presaged the broader trend of ministerial usurpations that eventually led to the Partition of Jin and the Tian takeover of Qi.