A Chinese Ch'an monk of the T'ang dynasty who belonged to the House of Kuei-yang among the Five Houses. Originally from Kuang-tung province, he left his family at the age of 9; at 17, he showed his determination to achieve enlightenment by shaving his head and cutting off two fingers. Interestingly, he did not receive the full monastic precepts until after he had received the inka.or certification of the authenticity of his enlightenment, from Kuei-shan Ling-yu (771–853). After receiving the precepts and conducting a study of the Vinaya.he returned to Kuei-shan and served his master for another fifteen years, and many of their dialogues during this time have been preserved and passed down. In 879, he moved to Ta Yang Shan (Great Yang Mountain) in Kiangsi Province, which explains that part of his name.