The old man was Huang Shigong (黃石公; lit. "Yellow Rock Old Man") . The book was titled "The Art of War by Taigong" () and believed to be the "Six Secret Teachings" by Jiang Ziya, while some called it "Three Strategies of Huang Shigong". In legend, Zhang Liang returned to the indicated site 13 years later and did see a yellow rock there. He built a shrine to worship the rock and the rock was buried with him after his death.