Abstract

Following the establishment of the Lý Dynasty in 1009 (Kỷ Dậu), Lý Thái Tổ made a historical decision to relocate the capital from Hoa Lư to Đại La, renaming it Thăng Long. This move symbolized the aspirations of a newly unified state seeking to assert its sovereignty and foster long-term stability. It embodies the nation’s ambitions for growth, strength, and resilience, aligning with the broader vision of consolidating a centralized monarchy and ensuring the enduring success of the Lý Dynasty. From the outset of his reign, Lý Thái Tổ undertook critical steps to refine the central and regional administrative structures, strengthen the military, and promote economic and cultural development, thereby laying the institutional foundations for a sovereign, self-reliant state. Most notably, under the reigns of Lý Thánh Tông (1054-1072) and Lý Nhân Tông (1072- 1127), Đại Việt reached a period of significant development, achieving sufficient strength to resist external threats, maintain territorial integrity, and expand its borders. Based on historical records and research, this article aims to clarify the territorial evolution of Đại Việt under the Lý Dynasty, examining the political, military, and administrative structures that shaped its development during the period from 1009 to 1225.