Yang Zhengdao

Yang Zhengdao (, 618 – early 650s) or Yang Min was a Chinese figurehead installed by the Eastern Turkic Khaganate during the bloody Sui–Tang transition. He was a grandson of Emperor Yang of Sui, and "ruled" as King of Sui in an area around Dingxiang Commandery from 620 — when he was still an infant — to 630, the year he surrendered to the Tang Empire. His state is sometimes known in history as the Later Sui .

His father Yang Jian and grandfather Emperor Yang were both killed in a coup before he was born.

Background Yang Zhengdao was a member of the House of Yang, the ruling family of the Sui dynasty. His father Yang Jian was the Prince of Qi during Emperor Yang of Sui's reign. In April 618, a mutiny led by Yuwen Huaji killed Emperor Yang, Yang Jian, and many members of the family while they were touring in Jiangdu. Empress Xiao (his paternal grandmother and Yang Jian's mother) and presumably Yang Zhengdao's pregnant mother were among those spared. Yuwen Huaji seized them and took them north,

At that time, the Eastern Turkic Khaganate's Shibi Khagan was married to Princess Yicheng, previously his stepmother and a member of the Yang family. At Princess Yicheng's request, Dou Jiande — who was eager to enter into an alliance with the Turks — delivered remnants of the Yang family, including the former Empress Xiao and Yang Zhengdao, north of the Great Wall where they were welcomed into Turkic territory. including a "Branch Department of State Affairs", in Dingxiang Commandery.

Life Virtually nothing is known of his reign as a puppet, except that his subjects included many Sui refugees. where they lived out the rest of their lives. . He died early in the Yonghui period (650–655).

Yang Chongli's sons Yang Shenyu (楊慎餘), Yang Shenjin (楊慎矜) and Yang Shenming (楊慎名) also held high positions under Emperor Xuanzong, schemed against other officials with Yang Guozhong and Li Linfu, but later in life crossed with them and were forced to death by Emperor Xuanzong.

Yang Shenjin's son Yang Jian (杨谏) held the position of governor of Yue Prefecture (岳州). Yang Shenyu's son Yang Yue (杨岳) held up to positions such as government superintendent (少府監).