Prince Bei of the Liao dynasty, who …

Years: 936 - 936

Prince Bei of the Liao dynasty, who is still an honored guest at the Tang court at the time, writes to his brother Emperor Taizong (Yelü Deguang), advising him to invade the Tang.

Instead, Taizong lends military support to a rebellion led by Shi Jingtang, a Tang governor and son-in-law of the former Emperor Mingzong.

With Khitan help, in 936 Shi Jingtang succeeds in replacing the Later Tang with his own Later Jin Dynasty.

After some negotiation with the more powerful Khitans, he cedes sixteen border prefectures stretching from modern-day Datong (Shanxi province) to the coast of the Bohai Sea east of what is now Beijing, to the Liao.

Since the Sixteen Prefectures contain numerous strategic passes and fortifications, the Khitans now have unrestricted access to the plains of northern China.

Shi Jingtang also agrees to treat Emperor Taizong of Liao as his own father, a move that symbolically elevates Taizong and the Liao to a superior position.

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