Raul's name is Derun, and he is the first12nd generation Shi Tian. Zhang Tongxuan's eldest son. According to Hanshu Tianshi Family, he is proficient in Confucian classics and never forgets anything. He is especially good at hallucinations. Emperor Gaozong summoned him and asked about the way to govern the country and the people. He said, "Doing nothing is the rule of the world." Gaozong is very grateful. At the age of 98. In the 13th year of Zheng Zhi (1353), he was awarded the title of "Shangqing Xuande Taihe Zhenjun".