《韩非子·难三》
公子宰是周王朝太子，其弟公子根受宠，于是凭借东州争夺君位，周分成东、西两个小国。
公子宰，周太子也，公子根有宠，遂以东州反，分而为两国。
Prince Zai was crown prince of the Zhou dynasty, his younger brother Prince Gen was favored and so fought for the throne using Dongzhou, Zhou was divided into two small states, East and West.