Sun Suzhen

Sun Suzhen (孫素真) (16 October 1895 - 4 April 1975) was the 18th matriarch of I-Kuan Tao. She was the successor of Zhang Tianran, I-Kuan Tao's contemporary founder as well as Zhang's third wife. Sun was also known as Ming Shan (明善) or Hui Ming (慧明), her religious name.

Sun was born in Shan County, Shandong province on the 28th day of the eighth lunar month in 1895. She was introduced to I-Kuan Tao in 1908 and became the student of Lu Zhongyi, there she met Zhang Tianran. Zhang took her as his second wife (in name only, because it was inappropriate for an unwed woman to be seen traveling around with a man unescorted, the fake marriage was to eliminate rumours and staining Sun's name), which was believed to be Heaven's will and lifted her as the incarnation of Bodhisattva Yue Huei (Moon Wisdom), the counterpart of Ji Gong. Her followers regarded her to hold the seat of the 18th patriarch together with Zhang in 1930.

After the death of Zhang in 1947, she took control of I-Kuan Tao. Many of Zhang's followers followed her leadership. Only a small fraction stayed on with Madame Liu, the second wife of Zhang.