This paper considers the process of restructuring the views on Takenouchi-ryu, one of the Japanese traditional schools of martial arts, leading to its description as the oldest form of jiu-jitsu and as the origin of jiu-jitsu. What authorities were used by Kobudo Takenouchi-ryu officials to develop and publicize this idea? How were these authorities used? In addition, we discuss what factors led Kobudo Takenouchi-ryu officials to re-construct their self-representation through the publication of an official book on Kobudo Takenouchi-ryu, Nihon Jiu-jitsu no Genryu Takenouchi-ryu, in 1979. This paper makes a contribution to genealogical study of Kobudo, traditional martial ways in Japan, within Japanese cultural studies.
　　First, we analyzed three publications describing Takenouchi-ryu, written by Kobudo Takenouchi-ryu officials from 1973 to 1982. In these three publications, these officials used three classical scrolls of the school, written between 1714 to 1844, as legitimation of their discourse. However, critical research has not found the official discourse of Kobudo Takenouchi-ryu to be well founded in these classic books. It has been found that Kobudo Takenouchi-ryu officials in fact used another source of authorization, a history of Kodokan Judo written by Kodokan Judo officials.
　　Second, we analyzed five books describing the history of Kodokan Judo, published from 1868 to 1988. The results showed that the connection between Takenouchi-ryu and Kodokan Judo was formed as part of the historical development of judo in Japan. According to this progressive view of history, judo developed from sumo to kumiuchi (a form of battlefield-oriented armored grappling), from kumiuchi to jiu-jitsu, and from jiu-jitsu to judo. This genealogy was developed based on the ideas of Mamoru Sakuraba, the first to write a book on the history of judo, describing the historical development of Kodokan Judo. Sakuraba also regarded Takenouchi-ryu as jiu-jitsu. However, Sakuraba did not assign the origin of jiu-jitsu to this school. Sanzou Maruyama, who was the first to write an official history of Kodokan Judo, introduced Takenouchi-ryu into the historical development. Maruyama proposed the fact that Takenouchi-ryu was a school of kogusoku, and kogusoku was the origin of jiu-jitsu, implying that Takenouchi-ryu was the origin of jiu-jitsu. It was clear that Maruyama was the first to consider Takenouchi-ryu to be the origin of jiu-jitsu, and his view was fixed in subsequent descriptions of the history of Kodokan Judo.
　　Third, we analyzed six papers referring to Takenouchi-ryu, written by Jigoro Kano, the founder of Kodokan Judo, from 1888 to 1926. In these papers, Kano emphasizes the Japanese origins of jiu-jitsu among the grappling arts. Kano denies the legacy of Chin Genpin, a famous Chinese writer and artist, as the originator of jiu-jitsu, instead placing Takenouchi-ryu at the center, which was regarded as a school of Kogusoku: grappling in light armor, either empty-handed or with a variety of short weapons. With this adoption of Takenouchi-ryu into the historical description of jiu-jitsu, Kano accepted two premises. The first was that Takenouchi-ryu is a school of jiu-jitsu. The second was that Takenouchi-ryu was founded in 1532. Almost all historical descriptions in Kodokan Judo take up these premises, making it common knowledge in the history of Kodokan Judo. However, the premises themselves have never been verified. There is a big issue with the second premise in particular. Takenouchi-ryu claims that it was founded in the sixth month of the Tenbun era. However, historical records show that the Tenbun era started in July, making the claim for 1532 as the foundational date of Takenouchi-ryu obviously suspicious.
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