Cai Jing
Cai Jing and Tong Guan were two of the officials Emperor Huizong asked in 1115 to evaluate the proposal that the Song ally themselves with the Jurchen against the Liao. Huizong was not interested at first, and continued "to get mixed reports from his officials... [In 1118], Tong Guan, in a memorial that has not been preserved, proposed taking advantage of the disorder in Liao to regain Yan and Yun [two former Song territories]...Huizong wanted Cai Jing's opinion of Tong Guan's proposal and several times sent a eunuch to ask Cai Jing what he thought of it. It was not until Huizong kept Cai Jing after an audience and asked him directly, however that Cai Jing was willing to express his opinion. He told Huizong that he did not have confidence in Tong Guan." Despite other warnings, Huizong disregarded Cai Jing's concerns. "Not long afterwards, in 1120/6, Cai Jing retired, quite possibly because Huizong was tired of his resistance to the new alliance [between the Song and the Jurchen, who later betrayed their Song allies]."