However archaeological remains of the old imperial city of Hanoi, Thang Long, were found on the site and therefore the construction of a new building on the site was delayed.
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However, it is known that he was a charismatic figure who quickly gathered thousands of followers in eastern Hưng Hóa and western Sơn Tây provinces, and moved them directly against the capital Thăng Long, now modern Hanoi.
In 1010, King Lý Thái Tổ moved the capital from Hoa Lư to Đại La, which decision was explained in his Chiếu dời đô (Royal proclamation of moving capital): he saw a Rồng vàng (yellow dragon) fly around on the clear blue sky, so he changed the name of Đại La to Thăng Long, meaning "Vietnam's bright and developed future".