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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".
When he died in 1005, the Lê Dynasty went into decline; five years later, in 1010, Lý Công Uẩn declared the Lý Dynasty and moved the capital from Hoa Lư to the area of modern Hanoi.