《左传·襄公·襄公二十五年》
秋季，七月二十日，诸侯在重丘一起结盟，这是由于跟齐国讲和的缘故。
秋七月己巳，同盟于重丘，齐成故也。
In autumn, on the twentieth day of the seventh moon, the feudal lords made an alliance together on Chonqiu, because they had reconciled with the State of Qi.