Answer:
"Việt" is the same as the Chinese word "Yue", a name in ancient times of various non-Chinese groups who lived in what is now northern/southern China and northern Việt Nam. In 1010 Lý Thái Tổ, founder of the Lý Dynasty, issued the "Edict on the Transfer of the Capital" and moved the capital of Đại Cồ Việt to Thăng Long (Hanoi) and built the Imperial Citadel of Thăng Long where the Hanoi Citadel would later stand.
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