Lê Hoàn
In 980, after hearing about the demise of Đinh Bộ Lĩnh, the Song emperor dispatched his army to invade Đại Cồ Việt (the name of Vietnam during the Đinh dynasty). In response, Dowager Empress Dương Vân Nga and the court unanimously enthroned Lê Hoàn to be the emperor of Đại Cồ Việt because the current emperor was too young. After battling the Song army twice, Lê Hoàn (now emperor Lê Đại Hành) expelled the invaders from his realm. As such, the reign of Đinh Toàn came to an end and the Đinh dynasty collapsed in 980.