Qiu Chuji (1148–1227), styled Master Changchun, was Wang Chongyang's most politically consequential disciple — and one of the few Taoists who changed history directly. The Travels of the Perfect Man Changchun, written by his disciple Li Zhichang, records his greatest act: in 1220, at seventy-four, he rode west for two years to the Hindu Kush to meet Genghis Khan, who had summoned him seeking the secret of immortality.
His answer: there is no pill of immortality; there is only preserving life — and the way to preserve life is to stop killing. The Khan accepted his teaching, granted amnesty to the multitudes under his protection, and entrusted to him the administration of all Taoists of the empire. He returned to Yanjing and presided over the teaching at the palace that is now Beijing's White Cloud Temple; his tomb is there to this day.