In the fourth year of Ning'an reign of Emperor Ai, the Queen Mother passed away. The four families of Beiyuan, Xihuang, Dongyue and Nanzhao met in Yongchang, Huayi. They divided the east and west by ridges and drew rivers from north to south. At this point, the world was divided into four parts and all the countries stood side by side. It was called "the troubled times" in history. "Tales of Troubled Times" book: "In the first year of troubled times, four families divided their power."
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