Li Chongjun
It is not known when Li Chongjun was born, but it was recorded that he was the third son of Emperor Zhongzong (Li Xian), although his younger brother Emperor Shang was born in either 695 or 698, and so he must be born sometime there before. It is not known who his mother was other than that she was not Emperor Zhongzong's wife Empress Wei. It is further unknown whether he was born before or during Emperor Zhongzong's brief first reign in 684, or during his exile from 684 to 698. However, upon the recall of Li Xian, then carrying the title of Prince of Lulin during the reign of Li Chongjun's grandmother Wu Zetian, to the capital Luoyang, Wu Zetian created Li Chongjun the Prince of Yixing.