《汉书·传·魏豹田儋韩王信传》
田横对他的门客说： 起初我和汉王一样都是面南而称王的人物，如今汉王做了天子。而我则成了亡国的俘虏，要北面称臣降服于他，实在是令人羞愧难当啊。
谓其客曰： 横始与汉王俱南面称孤，今汉王为天子，而横乃为亡虏，北面事之，其愧固已甚矣。
Tian Heng said to his guests: In the beginning, I and the King of Han were both equal as kings, but now the King of Han has become the emperor. However, I am becoming a surrendered captive of a fallen kingdom and have to kneel down to submit to him. This is really shameful.