 Complete the following phrase:  These purposes of the emperors and Lê Văn Hưu explained why the historian chose the foundation of the Kingdom of Nam Việt in 207 BC by Triệu Đà as the starting point for the history of Vietnam, an opinion which was challenged by several Vietnamese historians from Ngô Thì Sĩ in eighteenth century to modern historians because the kings of Nam Việt were of Chinese origin. Based on the independence of Nam Việt from the Han dynasty, Lê Văn Hưu considered its founder Triệu Đà the first and fine example of a Vietnamese ruler caring for the independence of the country. Another example for Lê Văn Hưus interest in the theme of Vietnams equality with China was his remark on the enthronement in 968 of Đinh Tiên Hoàng who was considered by Lê Văn Hưu the successor of Triệu Đà in reclaiming the identity of Vietnam while actually it was Ngô Quyền who marked the end of the northern domination in Vietnam in 938 with his victory in the 