Zhangsun Wuji
Emperor Taizong agreed, and as Zhangsun Wuji proposed creating another son by Empress Zhangsun, Li Zhi the Prince of Jin, crown prince, Emperor Taizong did so, putting Li Tai under house arrest as well and reducing his title, although keeping the title a princely title. In fall 643, Emperor Taizong exiled both Li Chengqian and Li Tai—in the case of Li Chengqian, to Qian Prefecture (黔州, modern southeastern Chongqing).