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In the first year of King Weilie of Zhou Dynasty (425 BC), the ancestors of the Dai people in the middle and upper reaches of the Lancang River and Nujiang River formed an alliance country with "Mengzhang" (today's Baoshan Basin, Chinese translation as "Chengxiang Kingdom") as the center. Mengda light". Today, Dehong Prefecture is part of "Mengdaguang" (Ailao State). "Meng" in Dai language means "place or country", "Zhang" means "elephant", and "Mengzhang" means "the kingdom of elephants" or "the country of elephants". "Mengzhang" is the "Chengxiang Kingdom" recorded in Sima Qian's "Historical Records"; "Mengdaguang" is the "Ailao Kingdom" recorded in ancient books such as "Huayang Guozhi" and "Book of the Later Han". In the second year of the Han Dynasty (109 BC), the Han Dynasty conquered the Dian (Dianchi Lake area), Kunming (Erhai Lake area), Xi (north of Erhai Lake) and other countries and tribes east of "Mengdaguang" (Ailao Kingdom). The establishment of counties and counties in the original territory of "Mengdaguang" and the extension of power to "Mengdaguang" (Ailao Kingdom) prompted many Dai ancestors to migrate westward across the Nu River, and Dehong was further developed. In 47 years, "Zhao Duguang" (King Ailao) Xianli led the tribes of "Mengdaguang" (Ailao Kingdom) to surrender to the Han Dynasty, and "Mengdaguang" (Ailao Kingdom) became a satellite state of the Han Dynasty. After that, "Zhao Duguang" was forced to move the royal city from "Mengzhang" to "Mengmian" (Tengchong Basin) to the west of the Nu River. In 69 years, Liu Maung of "Zhaodaguang" once again led 77 tribes of "Mengdaguang" to surrender to the Han Dynasty. The Han Dynasty delimited the original "Mengdaguang" territory that had occupied Zhi County and added it to Yizhou County, and added The unoccupied "Mengdaguang" territory was set up as Yongchang County, which was jointly governed by "Zhaodaguang" and the governor of Yongchang County. Dehong belongs to Ailao County under the jurisdiction of Yongchang County (today's Dehong Prefecture and the western part of the Nu River in Baoshan City).
Reference for the above content: Baidu Encyclopedia-Dehong