Man'yōshū Jidai-kō
Man'yōshū Jidai-kō (万葉集時代考) is a Japanese research work written in Japan's early medieval period. It was written by the famed "waka" poet Fujiwara no Shunzei. Authorship and date. "Man'yōshū Jidai-kō" was written by Fujiwara no Shunzei, at the beginning of the Kamakura period. It was intended by Shunzei to answer the questions posed by the Gokyōgoku Regent (後京極摂政) Fujiwara no Yoshitsune. It contains a note that refers to Yoshitsune as "taishō" (于時大将), a title he held between Bunji 5 (1189) and Kenkyū 6 (1195). It has also been noted that it quotes the "Man'yōshū  Jidai Nanji" (万葉集時代難事) composed by during the Juei era (1182–1184). Based on these facts, it is believed that Shunzei created the work some time around Kenkyū 3 (1192). Title. Its title is sometimes shortened to "Manji" (万時). The inside title of the work reads "Manji: Gojō-den Goshōsoku" (万時・五条殿御消息). The "Zoku Gunsho Ruijū" text of the work has written on its cover Shunzei-kyō Man'yō Jidai-kō (俊成卿万葉時代考). Contents. The work is in one volume. It deals simply with the question surrounding the compilation of the "Man'yōshū", taking the position that since there is insufficient reliable evidence for the events  of the past, drawing easy conclusions about the past would be presumptuous, and based on the poems in the "Man'yōshū" itself comes down ultimately on the side that dates it to the Nara period. The work is important as a statement of the opinion of Shunzei, a man who was at the pinnacle of the poetic world of his time, when he was in his late seventies (likely around 79 by Japanese reckoning). Textual tradition. The manuscript in the holdings of the Imperial Household Agency Archives and Mausolea Department was copied by Emperor Reigen. Another copy, in the holdings of  the Ochanomizu University Library, contains an ownership stamp of the "Onkodō archives" (温古堂文庫) indicating that it was copied in early autumn in Tenmei 4 (1784) by . Other copies are in the holdings of the Tōyō Bunko, the University of Tokyo Library, the Nihon University Library, etc. These are all copied from a copy attributed to Shunzei himself and passed down in the Kujō family. The "Zoku Gunsho Ruijū" text is a critical edition based on the Imperial Household Agency copy.