During the East Han Dynasty (25-220 CE), the first Taiost priest, Zhang Daoling (also known as Zhang Tianshi), built the Zhengyi Temple to practice alchemy. It was here that he brewed and consumed the mystical elixir of life, a magical potion that would deliver eternal youth. Since then, many generations of Taoist priests have passed down the alchemy of elixirs, believed to purify the body in preparation for immortality. Legend tells that one day, while Zhang was meditating, he received a message from Lao Tzu, the founding master of Taoism, that enabled him to create a special elixir that would bring him immortality. While Zhang was brewing his elixir, a dragon and tiger spirit suddenly appeared and led him to a stone building that housed the secrets of the Three Emperors that would allow him to ascend to heaven. After years of meditating and practicing alchemy, Zhang finally consumed the precious elixir, and at age 123, he ascended to heaven to spend the rest of his immortal life.