A Chinese Biographical Dictionary/Chia Chih-yen
317 Chia Chih-yen 賈直言. Died A.D. 835. His father having been sentenced to drink poison, he seized the cup and drained it, recovering by a miracle, with no other result than a chronic lameness. Touched by this act of devotion, the Emperor Tai Tsung commuted the father's punishment to banishment to Kuangtung, whither he was accompanied by his son (see Tung Shih).