Hua Tuo
The oldest extant biographies of Hua Tuo are found in the official Chinese histories for the Eastern Han dynasty (25-220) and Three Kingdoms period (220-280) of China. The third-century historical text "Records of Three Kingdoms" ("Sanguozhi") and fifth-century historical text "Book of the Later Han" ("Houhanshu") record that Hua Tuo was from Qiao County (), Pei Commandery (), which is in present-day Bozhou, Anhui, and that he studied Chinese classics throughout Xu Province (covering parts of present-day Jiangsu and Shandong provinces). He refused employment offers from high-ranking officials (e.g. Chen Gui) and chose to practise medicine.