Hậu Lý Nam Đế , c. 518 – 606 AD was the last emperor of the Early Lý Dynasty, founded by his cousin Lý Nam Đế. He reigned in Vạn Xuân from 571 to 602 AD. 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 where he killed himself. Lý Phật Tử then proclaimed himself Lý Nam Đế II and went on to rule Vạn Xuân 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 Liang 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 Nam Đế II realized his army would not be strong enough to engage in a major conflict with the Sui invading force.
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