Jin dynasty and the Northern and Southern dynasties period

Chinese dynasties of Jin, Liu Song, Southern Qi, and Northern Zhou maintain their rules around the commandery in the Kunming area. Southwest Yunnan and the eastern rugged, mountainous areas were still enjoying relative independence, ruled by tribal kings and chieftains with little Chinese influence.

Nanzhao Kingdom

In 649 AD the chieftain of the Yi Mengshe tribe, Xinuluo founded a kingdom in the area of Lake Erhai. In the year AD 737, Piluoge united the six zhaos in succession, establishing a new kingdom called Nanzhao.

In 750, Nanzhao invaded the Tang dynasty. In retaliation, the Tang sent an army against Nanzhao in 751, but this army was soundly defeated at Xiaguan. In 754, another army was sent, this time from the north, but it too was defeated. Bolstered by these successes, Nanzhao expanded rapidly, first into Burma, then into the rest of Yunnan, down into northern Laos and Thailand, and finally, north into Sichuan. In 829, Chengdu was taken; it was a great prize, as it enabled Nanzhao to lay claim to the whole of Sichuan province, with its rich paddy fields.

The Tang dynasty retaliated and by 873, Nanzhao had been expelled from Sichuan and retreated to Yunnan. Taking Chengdu marked the high point of the Nanzhao kingdom, and it was a watershed: from then on, the Nanzhao Kingdom slowly declined. n 902, the Nanzhao dynasty was overthrown, and it was followed by three other dynasties in quick succession until Duan Siping seized power in 937 to establish the Kingdom of Dali.

Reference: Wikipedia

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