In 642, he restored Li Jiancheng's crown prince title. However, Li Jiancheng was never fully rehabilitated and his daughters still had the status of daughters of a common prince, rather than a crown prince.
In 642, he restored Li Jiancheng's title as crown prince. Nevertheless, Li Jiancheng did not regain full recognition, and his daughters continued to be regarded as the offspring of a common prince, not of a crown prince.