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Objective : Two famous medical doctors, Yoo Itae(以泰, 爾泰) and Riu Euitae(義泰), have beenwell known in academic world and public in Sancheong-gun. Yoo Itae is the progenitorof Majinhak which is the therapy for measles, he wrote a “Majinpyun” as the first bookof therapy for measles in Chosun. Riu Euitae, meanwhile, is a fictional medical doctorand a teacher of Heo Jun who became real without confirmation of historical truths byRoh Jeongwoo who heard about a name, Yoo Itae. Roh’s assertion was quoted in thereport of literatures, papers, novel, and telecast without verification. His assertion isexposed in novel and media and it has seriously distorted the history. The purpose ofthis study is to rectify the historical distortion. Methods : Various references study was performed. Confirmed a family tree, birth and deathyear, birthplace, sepulture, words on a tombstone, writing, collections of worksanthology and the existence of keepsake. Investigated records of royal family,Sancheong-gun papers, Sancheong Hyanggyo papers, Dongyuhagan, ChosunHanryuseungram and the record of Sawoo Munjip(anthology). Analyzed Roh Jungwoo’sconversation that tells Riu Euitae is a teacher of Heo Jun and contents of anencyclopedia. Listened to testimony of descendants and assertions of historian in ruralarea. Verified voice recording on books taken from at birthplace and the space ofactivity. Results : Yoo Itae is well shown in various records and medical writing books, whereas RiuEuitae does not. Riu Euitae is not a real person in the history. Roh Jeongwoo whoasserts Riu Euitae is a teacher of Heo Jun admits his mistake. But, the encyclopediarecord describing Riu Euitae is a teacher of Heo Jun, government official at Sancheongdistrict office, historians in rural area, historians in rural area who made a familyshrine, gravestone, a statue, memorial, historic site of Riu Euitae on Jinju Rui could notsuggest any evidences for the existence of Riu Euitae and for record Riu Euitae is ateacher of Heo Jun. Conclusion : Riu Euitae is neither a real person in the history nor a teacher of Heo Jun. RiuEuitae came from pronunciation confusion between ‘I’ and ‘Eui’ in Kyungsang province. Riu Euitae is Yoo Itae on Geochang Yoo who was a medical doctor of King, Sukjeongand wrote medical books including <Majinpyun>, <Silheomdanbang>, <Inseomungyunrog>.

Yoo Itae(劉以泰), Riu Euitae(柳義泰), Medical History, Traditional Korean Medicine