After killing his predecessor and brother Lê Long Việt, he took the throne and named his era Cảnh Thụy.

However, a lot of temples were created where people still worship him, and recently, some historians have proved that some rumours about his ruling style were exaggerated, and possibly fabrications.

[2] The Complete Annals of Đại Việt (Đại Việt sử ký toàn thư) recorded that in 992 he was granted the title Prince of Khai Minh (Khai Minh Vương, 開明王) and ruled over Đằng county (now Hưng Yên province).

In October 1005, Việt defeated Tích, forcing him to flee to Champa where he was subsequently killed by locals at the Cơ La estuary.

In the winter of 1005, Lê Long Đĩnh took the throne with the regnal name Khai Thiên Ứng Vận Thánh Văn Thần Vũ Tắc Thiên Sùng Đạo Đại Thắng Minh Quang Hiếu Hoàng đế (開天應運聖文神武則天崇道大勝明光孝皇帝) and gave his mother the title Hưng Quốc Quảng Thánh Hoàng Thái Hậu (興國廣聖皇太后).

However, Taizong chose to respect the tributary status that Đại Cồ Việt had towards the Song Empire, and he left the country alone.

According to the Complete annals of Đại Việt, Lê Long Đĩnh was one of the most brutal and sadistic rulers of Vietnam's dynastic era.

[a] His son Sạ was a child at the time, under the supervision of an official named Đào Cam Mộc (陶甘沐).