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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 a baby — to 630, the year he surrendered to the Tang Empire. His state is sometimes known in history as the Later Sui ().