Seng-ts’an ［僧璨］ (d. 606) (PY Sengcan; Sōsan): Also known as the Meditation Master Chien-chih. The third patriarch in the lineage of Zen (Ch’an) Buddhism in China. He studied the Zen teachings under the second patriarch, Hui-k’o. When Buddhism was suppressed by Emperor Wu (r. 560–578) of the Northern Chou dynasty, he hid himself on a mountain where he continued his practice. Seng-ts’an transferred the Zen teachings to Tao-hsin. He authored the work On Trust in the Heart.