The Case of Prince Zhu Ru of Cheng Fleeing to Lu with Fuzhong

In 615 BC, Zhu Ru, the crown prince of the State of Cheng, took up residence in the city of Fuzhong without the consent of his people, causing deep dissatisfaction. When the reigning Count of Cheng died, the people of Cheng bypassed him and installed a different ruler. In response, Zhu Ru defected to the neighboring State of Lu, bringing with him the city of Fuzhong and a precious ritual object, the Cheng Gui. Duke Wen of Lu received him with the full ceremonial honors reserved for a reigning feudal lord, a clear departure from the established rites. The Spring and Autumn Annals recorded the event as “The Count of Cheng came to flee,” deliberately using the title “Count” to satirize Lu’s overstepping reception and Zhu Ru’s illegitimate claim. The affair was seen as a dual violation: treason against Cheng and a breach of the Zhou feudal ritual order.

No formal trial took place. Judgment was delivered through the historiographical method of “praise and blame” in the Spring and Autumn Annals. By recording the entry as “The Count of Cheng came to flee” and omitting the name of the surrendered territory, the chronicle implicitly condemned both Zhu Ru’s treachery and Lu’s acceptance of ill-gotten gains, branding the act as a grave ritual impropriety (fei li).

Whether Zhu Ru’s flight with territory and treasures constituted treason; whether the people of Cheng had the legitimacy to enthrone a new ruler while the crown prince was still alive; whether Duke Wen of Lu’s reception of a fugitive prince with lordly rites violated the Zhou ritual code on interstate relations and feudal hierarchy.

The case became a canonical example in Confucian scholarship of how the annals uphold the Zhou ritual order through subtle wording. Commentators such as those in the Zuo Tradition and the Gongyang Commentary repeatedly cited it to illustrate the principle that a state must not grant undue honor to a disloyal prince, and to debate the limits of asylum, territorial integrity, and the binding power of ritual in the interstate relations of ancient China.