元明天皇
The "Kojiki" preface indicates that leading families also kept their own historical and genealogical records; indeed, one of the reasons it gives for the compilation of the "Kojiki" is the correction of errors that had supposedly crept into these documents. According to the preface, Emperor Tenmu (reigned 673–686) ordered the review and emendation of clan documents and commissioned a certain court attendant ("toneri") of exceptional memory named Hieda no Are to memorize records and oral traditions concerning the imperial lineage. Beyond this memorization, nothing occurred until the reign of Empress Genmei (reigned 707–715), who on the 18th of the 9th month of 711 (Wadō 4) ordered the courtier Ō no Yasumaro to record what had been learned by Hieda no Are. He finished and presented his work to Empress Genmei on the 28th of the 1st month of 712 (Wadō 5).