| Li Chengqi | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Prince of Ning 寧王 | |||||||||
| Reign | 716–742 | ||||||||
| Prince of Song 宋王 | |||||||||
| Reign | 710–716 | ||||||||
| Prince of Shouchun 壽春郡王 | |||||||||
| Reign | 693–710 | ||||||||
| Crown Prince of the Tang dynasty | |||||||||
| Reign | 684–690 | ||||||||
| Predecessor | Prince Yide | ||||||||
| Successor | Wu Dan | ||||||||
| Prince of Yongping 永平郡王 | |||||||||
| Born | 679 | ||||||||
| Died | 5 January 742 (aged 63) | ||||||||
| Spouse | Lady Yuan Lady Wei | ||||||||
| Issue | Li Jin, Prince of Ruyang | ||||||||
| |||||||||
| House | Tang (唐) | ||||||||
| Father | Emperor Ruizong of Tang | ||||||||
| Mother | Empress Liu | ||||||||
Li Chengqi | |
|---|---|
| Grand Commandant | |
| In office 733–741 | |
| Preceded by | Li Dan |
| Succeeded by | Li Chu |
| Minister over the Masses | |
| In office 713–713 | |
| Preceded by | Wu Youji |
| Succeeded by | Li Chengyi |
| Minister of Work | |
| In office 712–713 | |
| Preceded by | Wu Sansi |
| Succeeded by | Li Shouli |
Li Chengqi (Chinese: 李成器) (679 – January 5, 742[1]), known as Wu Chengqi (Chinese: 武成器) during the reign of his grandmother Wu Zetian and as Li Xian (Chinese: 李憲) after 716, formally Emperor Rang (Chinese: 讓皇帝, literally, "the emperor who yielded"), was an imperial prince of the Tang dynasty who served as crown prince during the first reign of his father Emperor Ruizong, who yielded that position to his younger half-brother Li Longji (Emperor Xuanzong) during Emperor Ruizong's second reign. Li Chengqi had a number of children, including his oldest son, Li Jin, the Prince of Ruyang, who was called one of the Eight Immortals of the Wine Cup by famous poet Du Fu.
According to historical records, Li Chengqi was close to his younger brother, Li Longji (later Emperor Xuanzong), and was never ambitious. Despite his never having been emperor, he was posthumously honored as an emperor by Emperor Xuanzong.