Lý Nhân Tông
Tensions between the Lý and Song increased during the reign of Lý Nhân Tông (1072–1128), whose military seized Qinzhou, Lianzhou, and Yongzhou along the Lý-Song border after his attack on Champa. In 1075, Song prime minister Wang Anshi informed the Song emperor of the decline in the Lý's power following its defeat by the Champa, prompting the Lý-Song War during which the Song launched a failed invasion. The conflict ended after Lý Nhân Tông sought reconciliation following Lý military successes.