《晋书·志·第十四章》
后来任命何祯为秘书丞，可是事先已经有了秘书丞，就任命何祯为秘书右丞。
后以何祯为秘书丞，而秘书先自有丞，乃以祯为秘书右丞。
He Zhen was later appointed Secretary Cheng, but since there was already a Secretary Cheng, He Zhen was appointed Right Secretary.