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Xuan Su, whose surname and given name are unknown, claimed to be from Hejian. He feared consuming Crotonis Fructus (Badou) and Calamina (Yunmu), sold medicine in the city markets, and treated illnesses for people. The Prince of Hejian purchased his medicine and ingested it, subsequently expelling more than ten snakes. When the Prince asked about the root cause of his illness, Xuan Su said, "The Prince's illness is the residual karmic retribution accumulated over six generations, a matter beyond the Prince's knowledge. Because the Prince frequently released fawns, his benevolence moved Heaven's heart, thus bringing this punishment upon him." The Prince wished to marry his daughter to Xuan Su, but Xuan Su fled during the night, and his whereabouts became unknown. Later, someone saw him beneath Mount Changshan (from *Biographies of Divine Immortals*).

Zhang Ji, courtesy name Zhongjing, was from Nanyang in the Eastern Han Dynasty. He received medical instruction from Zhang Bozu, a fellow townsman, excelling in treatment and specializing particularly in classical formulas. He was recommended as a Filial and Incorrupt Candidate (Xiaolian) and served as Grand Administrator of Changsha. Later, he became a renowned physician in the capital, unrivaled in his time; contemporaries believed that even Bian Que or Cang Gong could not surpass him (from *He Yan's Biographies* and *Preface to Zhang Zhongjing's Formulas* in *Jia Yi Jing*).

Guo Yu, Vice Director of the Imperial Medical Bureau, was from Guanghan. Emperor He tested Guo Yu's diagnostic skills by having favored eunuchs and beautiful palace maids mix together behind curtains, instructing Guo Yu to diagnose them. Guo Yu stated, "The left pulse corresponds to Yang, the right to Yin; this is not the pulse of a single woman." The Emperor found this highly remarkable (from *Book of Later Han*).

Cheng Gao, also from Guanghan, naturally loved classical formulas and pursued the Dao with tireless dedication. Whenever he encountered someone skilled in an art superior to his own, he would travel a thousand miles to submit to their teaching with deep reverence. Upon hearing that Fu Weng was proficient in medical arts, the *Classic of Acupuncture* (*Zhen Jing*), and pulse diagnosis, he sought these teachings for years until finally obtaining them. He gained fame in his contemporary era and served as Vice Director of the Imperial Medical Bureau (from *Book of Later Han*).

Fu Weng, whose name is unknown, fished in the Fu River and thus adopted the title "Old Man of Fu." He was proficient in medical arts, treating patients regardless of noble or humble status, working tirelessly to save them without seeking reward. He was highly respected by his contemporaries (from *Book of Later Han*).

Shen Jian was from Danyang. His father held a high official position, but Shen Jian alone cherished learning and the Dao, refusing to serve in government. He studied Daoyin (guiding and pulling exercises) and Fushi (ingesting substances) techniques for longevity and rejuvenation, and could also treat diseases; whether the illness was mild or severe, he cured it promptly. Shen Jian practiced grain avoidance (Dugu), achieved lightness allowing flight, appeared and disappeared at will, and continued thus for over three hundred years before vanishing, his whereabouts unknown (from *Biographies of Immortals*).

Zhang Bozu was from Nanyang. He possessed a calm and simple disposition, deeply devoted to medical arts. His diagnoses and prescriptions were precise and thorough, and his treatments were entirely successful. He was respected by his contemporaries. Zhang Zhongjing, a fellow townsman, marveled at him and took him as a teacher, thereby gaining great reputation (from *Preface and Discourse on Zhang Zhongjing's Formulas*).

Du Du, whose origin is unknown, was a disciple of Zhang Zhongjing. He had broad and quick insight, profound demeanor, was indifferent to arrogance, and valued relief for others. Serving Zhang Zhongjing, he frequently obtained secret formulas, thus becoming a renowned physician (from *Zhongjing Fang*).