Emperor Wen of Sui
The newly Sui Empire defeated the Chen dynasty in 589, unifying China in the process. Emperor Wen of Sui sent envoy to Vạn Xuân, demanded Lý Phật Tử to submit as a vassal state, but Lý had refused. In 602, Lý Phật Tử brided money to governor of Qi Zhuo Lệnh Hồ Hy, Emperor Wen of Sui felt angry and executed Lệnh Hồ Hy for corruption. He ordered general Liu Fang invade Vạn Xuân with 100,000 troops. The king of Vạn Xuân (Lý Phật Tử) surrendered to the Sui, marking the beginning of renewed Chinese domination in Vietnam.