Shortly after Shi Chonggui's succession to the Later Jin throne, the tone of the Liao-Later Jin relationship began to chance, as Shi Chonggui, at Jing Yanguang's advice and against Li Song's, did not submit a "petition" but rather sent a "letter" to the Liao court to announce his succession, essentially declaring the states equal. Moreover, in the letter, he did not refer to himself as "subject" but only as "grandson." This caused Emperor Taizong to be angry and respond, "How do you dare not to first report to me before taking the throne?" Jing authored an insolent response on Shi's behalf. Thereafter, Zhao Yanshou, who was then Liao's military governor of Lulong, began to advocate that Emperor Taizong attack Later Jin, hoping that Emperor Taizong would replace Shi with Zhao himself. Emperor Taizong began to be enticed.