The Case of Duke Qing of Qi Detaining Jin Envoy Xi Ke

In 592 BC, Xi Ke, the lame chief minister of Jin, was sent as an envoy to Qi. Duke Qing of Qi ordered his mother, Xiao Tong Shu Zi, to observe the envoy from behind a curtain; her laughter at Xi Ke's limp caused a profound diplomatic affront. Xi Ke swore revenge and returned to Jin demanding war, which was initially refused. The following year, when Qi envoys visited Jin, Xi Ke personally seized and executed them, shattering diplomatic relations. In 589 BC, Jin routed Qi at the Battle of An, almost capturing Duke Qing. As victor, Xi Ke demanded Xiao Tong Shu Zi as a hostage. Under mediation, Jin accepted a mitigated peace treaty without the hostage clause. The core dispute centered on whether personal humiliation justified the extrajudicial killing of envoys and war, challenging the sanctity of diplomatic immunity.

No formal judicial trial took place. Politically, after Qi's military defeat at the Battle of An, a peace treaty was concluded. Jin's initial demand for the Qi dowager duchess as a hostage was withdrawn following mediation by other states. Qi submitted to Jin, and the executed Qi envoys received posthumous rehabilitation as part of the settlement.

Whether the personal humiliation of an envoy could legally or morally justify the retaliatory execution of foreign envoys and the initiation of war; the extent and inviolability of diplomatic immunity under the inter-state norms of the Spring and Autumn period.

The case reinforced the customary principle that envoys must not be insulted or harmed, strengthening diplomatic inviolability in ancient Chinese inter-state relations. It illustrated how a ruler's breach of decorum and a minister's private vendetta could escalate into full-scale war, altering the balance of power and consolidating Jin's hegemony. The event became a classic moral lesson on the catastrophic consequences of ridiculing an ambassador.