 In winter 646, he issued an edict extensively accusing Xiao of being overly obsessed with Buddhism—citing Xiao's ancestor Emperor Wu of Liang and Emperor Wu's son Emperor Jianwen of Liang as examples that Xiao was falling into the traps of.He demoted Xiao to the post of prefect of Shang Prefecture (商州, roughly modern Shangluo, Shaanxi), but also cancelled Xiao's title as Duke of Song.In 647, however, Emperor Taizong recalled Xiao to be an imperial advisor (but not chancellor) and restored his title of Duke of Song.