Zhao Yanshou
In the aftermaths of Emperor Taizong's death, the Liao general Zhao Yanshou (also a son-in-law of Li Siyuan's, who was also captured by Emperor Taizong when Later Tang fell), to whom Emperor Taizong had previously promised the Chinese throne but then reneged on the promise, tried to take over Heng and claim the title of regent over the southern court (i.e., the former Later Jin domain). The ethnically Khitan Liao generals, however, had already resolved to support Emperor Taizong's nephew Yelü Ruan the Prince of Yongkang, and they quickly tricked Zhao and arrested him. Yelü Ruan then took the throne (as Emperor Shizong) at Heng.