Lê Hoàn
The Song dynasty wanted to take advantage of the turbulent situation in Đại Cồ Việt in order to reestablish Chinese control over the country, and sent an army to invade Vietnam. In this crisis, Lê Hoàn, the commander-in-chief of Đinh Bộ Lĩnh's army, stepped into the power vacuum, dethroned the child emperor, eliminated his opponents at court, and entered into illicit relations with the Empress Dowager Dương Vân Nga. Lê Hoàn defeated the Song invasion, proclaimed himself Emperor, and founded the Early Lê Dynasty. He continued to call the country "Đại Cồ Việt."