Yue Fei, a national hero, once put forward a slogan during the northern expedition to Jin, which was called "Go straight to Huanglong and welcome back the two saints". These two saints refer to Song Huizong, the father of Emperor Song Gaozong, and Song Qinzong, the brother of the Emperor. This slogan, which seems to be dedicated to the imperial court and has a strong patriotic color, aroused the emperor's strong dissatisfaction, and other factors eventually led to Yue Fei's death.