Li Deyu
It is not known when Li Yinheng was born. He came from a prominent aristocratic family, and both his great-grandfather Li Jifu and grandfather Li Deyu were chancellors. Li Deyu, in particular, was particularly powerful during the reign of Emperor Wuzong of Tang, controlling the affairs of state. After Emperor Wuzong was succeeded by his uncle Emperor Xuānzong, however, Li Deyu lost power and was eventually exiled, as was his son (Li Yinheng's father) Li Ye (李燁). Because of this, Li Yinheng was unable to obtain important offices early in his life.