information:extraction, structural:expansion
Tribute and intrigue

The minor Song official Lu Shen, a prefect in Guizhou, sent a message to Kaifeng in 1065 which reported that Nùng Tông Đán had apparently switched allegiance from Song to Lý, as well as united with the Quảng Nguyên chieftain Lưu Ký. When the now "mentally weak and distracted ruler" Yingzong—as Anderson describes him—received the report, he took no other action but to reassign Nùng Tông Đán with new honorific titles. The court took no action to resolve the problem, and Nùng Tông Đán later played a key role in the Lý–Song War of 1075–1077. The Song also gave official titles to other Vietnamese leaders despite their involvement in Nùng Trí Cao's rebellions and their pledged loyalty to Lưu Ký, the latter employed as a tribal official under King Lý Thánh Tông.