《左传·昭公·昭公十三年》
楚平王即位，在封了陈国、蔡国以后，就都让他们迁回去，这是合于礼的。
平王即位，既封陈、蔡，而皆复之，礼也。
When King Ping of Chu succeeded to the throne, after enfeoffing the states of Chen and Cai, he ordered them to move back, which is in line with the rituals.