The oldest Myobo kanmon in Japan is the one concerning interpretation of Regulations for selection of Taiho Ritsuryo (Taiho Code) included in "Hosoruirin," and was replied by FUJIWARA no Fuhito, Dainagon (Major Counselor) and Kadono no Okimi, Shikibukyo, who were involved in compilation of Taiho Code and also served as Ryokan, because there was no government post of Myobo hakase in those days.
日本最古の明法勘文は、『法曹類林』所収の大宝律令選任令の解釈に関するもので、当時は明法博士の官職が存在していなかったために、律令編纂に関与して令官を兼ねていた大納言藤原不比等と式部卿葛野王が回答している。