New History of the Five Dynasties
It is not known when Li Yichang was born. The traditional histories conflict on Li Yichang's relationship with his predecessor Li Sijian. The "History of the Five Dynasties", the "New History of the Five Dynasties", and the "Zizhi Tongjian" all indicated that he was Li Sijian's son. However, the "History of Song" indicated that he was the grandson of Li Sijian's predecessor and older brother Li Sigong.