An Investigation into the "Hat Phantom Incident" in the Second Year of the Tianxi Reign In 1018, the second year of the Tianxi reign, rumors of a "hat phantom" spread across the Northern Song Dynasty. Recorded in official historical documents including History of the Song Dynasty · Records of Five Elements, Continued Zizhi Tongjian Long Draft, and Compiled Administrative Records of the Song Dynasty, this is a documented mass abnormal rumor incident in the Song Dynasty. The incident began in t...