Hậu Lý Nam Đế

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Phật Tử was a cousin of Lý Nam Đế, who was stated to be of localized Chinese descent.[2][3][4][5][6] Additionally, according to historian Catherine Churchman, Phật Tử was referred as a Lĭ (俚) man,[7] which means Lý Phật Tử might be a leader of Tai-speakers,[8] who historically inhabited the Red River Delta from 200 AD to 700 AD.[9] Lý Phật Tử and Triệu Việt Vương had a peace agreement in place; however, Lý Phật Tử had ambitions to claim to the entire territory of Việt people. Around 570 AD, Lý Phật Tử's army overran Long Biên, a region that belonged to Triệu Việt Vương, and seized it. Triệu Việt Vương was caught by surprise and defeated, he retreated to the river Đại Nha (now in Nam Định Province, northern Vietnam) where he killed himself. Lý Phật Tử then proclaimed himself the Later Lý Nam Đế and went on to rule Vạn Xuân (Vietnam) as an independent state for the next 32 years.

In 602 AD, the new Sui dynasty emerged as the sole power in a unified China after having defeated the Chen dynasty. The new Sui Emperor Sui Wendi sent a 120,000-man army to invade Vạn Xuân and re-claim dominion over the Viet people. Lý Phật Tử realized his army would not be strong enough to engage in a major conflict with the Sui invading force. At the same time, he also received enormous pressure from his ruling administration to avoid any confrontation with the emerging Sui Dynasty. In the winter of 602, when the Sui force marched on Vạn Xuân, Lý Phật Tử decided to surrender in exchange for stability in the region.

The Early Lý dynasty, although defeated, proved that it was capable of independence and self-rule. Through more than 60 years of rebellion and defiance, the national sentiment of Viet people was awakened. When the northern imperial power began showing signs of weakness and disunity at the end of the Tang dynasty, the Việt people would seize the opportunity to slip from the Chinese rule.