《左传·昭公·昭公七年》
楚灵王做令尹的时候，打了国王用的旌旗去打猎，芋尹无宇砍断旌旗的飘带，说： 一个国家两个君主，有谁能忍受得了？ 
楚子之为令尹也，为王旌以田。芋尹无宇断之曰： 一国两君，其谁堪之？ 
When King Ling of Chu was still a Prime Minister, he used the royal standard to hunt. Wu Yu, the Palace Overseer, cut off the streamers of the standard, saying, "How can a nation have two sovereigns?" 