After Chu died in 719 and Yuan died in 729, Emperor Xuanzong engaged Chen Xilie and F*ng Ch*oy*n (***) to frequently explain the Tao Te Ching and the I Ching to him. Chen was initially promoted to be M*sh* Sh*oji*n (****), the deputy head of the Palace Library, and also succeeded Zhang Jiuling in heading the imperial institute J*xi*n Institute (***). Whenever Emperor Xuanzong was writing something of importance, Chen would assist him in drafting the language.
Emperor Xuanzong
Chen