Yamada Ippūsai Mitsunori (山田一風斎光徳) studied Jikishin Seitō-ryū as a youth until a time when he was injured. Thereafter, he began a study of Yagyū Shinkage-ryū heihō in a faction of the Edo line of that art. Later in life he returned to his first training, and eventually inherited that line of practice. Below I provide some context for this thinly attested figure, despite his promenance in the history of Jiki Shinkage-ryū, and provide a hypothesis on a way in which we can regard Jiki Shinkage-Ryū practice.
The Nihon dai-hyakka zensho (Nipponica) entry for Jikishinkage-ryū holds that Mitsunori first entered the gate of Takahashi Danjōzaemon Shigeharu and studied Jikishin Seitō-ryū, was not satisfied with it, took up various schools including the Unchū-ryū of the Yagyū Shinkage-ryū, returned to his original school at thirty-six, and at forty-eight in Jōkyō 3 (1686) was granted the tekiden inka.
Unchū-ryū (運籌流) was Kimura Sukekurō Tomoshige’s (木村友重) cover-name for the Yagyū transmission; he relinquished it in Kan’ei 11 when permitted to style himself Yagyū-ryū publicly, passing it to his fellow disciple Izubuchi Heibei (出淵平兵衛) of the Echizen Matsudaira house, and after Izubuchi too was allowed the Yagyū name the designation reverted to the Yagyū family. Izubuchi Moritsugu served the Fukui domain and died in Tenna 2 (1682). So “Yagyū-mon Unchū-ryū” in the 1660s–70s points to a retainer-branch line — and later research distinguishes an Echizen line and a Yagyū line of Unchū-ryū.
The Kōdansha Nihon jinmei daijiten entry gives only Takahashi Danjōzaemon as teacher, with service to Nagai Naohiro of Karasuyama.
Karukome offers no support for a Yagyū licence. His and Sakai’s 2015 Budōgaku kenkyū article works from Mitsunori’s own Heihō zakki (兵法雑記), and the passages they quote show him repeatedly styling himself second generation of Jikishin Seitō-ryū and grounding that standing explicitly in Takahashi Shigeharu’s menjō. An autograph in which a man documents his authority at length, and does so solely through Takahashi, is reasonably strong negative evidence: had he held a Yagyū licence of any grade, the zakki is where one would expect it
Recall, the Uncho-ryu (運籌流) ryūso had full transmission of Edo Yagyu Shinkage-ryu and wrote the 本識三問答 (Honshiki sanmondō, “Three Dialogues on the Original Consciousness”), which contains upper-level Yagyu gokui like seikosui and shinmyoken. So, that was a full line of technical Yagyu Shinkage-ryu practice, albeit under another (temporary) name drawn from their own densho.
Kimura Sukekurō Tomoshige (木村助九郎友重) stood inside the Edo transmission, not adjacent to it: his Heihō kikigaki (兵法聞書), composed in the Shōhō era and held at Hōtoku-ji, sets out ninety-eight articles recording Munenori’s and Mitsuyoshi’s heihō talk in reported speech, covering the kamae, enpi, ittō ryōdan, mutōdori, and the progression through ri, shin, and ura; and the citation runs both ways — Mitsuyoshi quotes Tomoshige’s kufū in the Tsuki no shō. Reciprocal citation between a disciple and the house heir is about as good as standing gets. The name was a reservation of the public style, not a limitation of content: Tomoshige ceded Unchū-ryū to Izubuchi Heibei in Kan’ei 11 on being permitted to call his art Yagyū-ryū publicly, and the name reverted to the Yagyū house once Izubuchi was likewise permitted. So the technical channel is adequate on its face for gokui-tier material — seikōsui (西江水), shinmyōken (神妙剣), suigetsu (水月), hōshin (捧心) — to be in circulation under that name
The name originates with Kimura Tomoshige (木村友重, 1585–1654), known by his common name Kimura Sukekurō (木村助九郎) — head disciple of Yagyū Munenori, later counted among the “Yagyū Shitennō,” and from 1634 a 600-koku retainer of Tokugawa Yorinobu in Kishū. Out of deference to his teacher’s school name he called his own teaching Unchū-ryū; in Kan’ei 11 (1634) he was permitted to use “Yagyū-ryū” publicly, and the Unchū-ryū name passed as second generation to his fellow student Debuchi Heibei (出淵平兵衛) of the Echizen Matsudaira house. When Heibei was in turn permitted to call his art Yagyū-ryū, the Unchū-ryū name was formally returned to the Yagyū house.
If we look at the content of Ippūsai’s Jikishinkage-ryū mokuroku, he has rearranged Sangakuen-no-tachi into Hōjō practice (Ogasawara’s mokuroku still lists Sangaku as a practce) and discarded the empi, kuka excerpts and tengusho kata that Ogasawara had practiced. In their place the Tō no kata are found, with references in densho annotations that matsukaze plays an analogous role to empi no tachi.
However, the bulk of the gokui cited by Ippūsai are those of the Edo line of Yagyū Shinkage-ryū, as preserved in Unchū-ryū. No gokui unique to Ogasawara that is not present in Unchū-ryū is preserved.
Izubuchi Moritsugu was a Fukui-domain retainer who died in Tenna 2 (1682); the tradition then continues, since Hirayama Kōzō succeeded to Unchū-ryū as fourth generation through his teacher Yamada Mohei, who had at one point entered Yagyū Shinkage-ryū, and later research recognises both an Echizen line and a Yagyū line of Unchū-ryū. That leaves a third-generation slot between Izubuchi and Yamada Mohei falling squarely inside Mitsunori’s window. Identifying the occupant of that slot — and whether he was accessible to a Nagai-house retainer in Edo — would be an interesting avenue to pursue, likely beyond my available time and resources.
That being said, I can now frame a hypothesis I have been building up to in the densho analysis and translation works that has occupied many late evenings over the last few months.
It is said that the Edo line of Yagyū declined and was not transmitted past a certain time.
On Munenori’s death in 1646 the 12,500-koku holding was divided — 8,300 to Mitsuyoshi (Jūbei), 4,000 to Munefuyu, 200 to Rettō Gisen — dropping the house from daimyo to hatamoto; after Mitsuyoshi’s death Munefuyu inherited, returned the 4,000, and with a 1,700-koku increase in Kanbun 8 (1668) was restored to daimyo status at 10,000 koku. Mitsuyoshi had died suddenly in 1650, shortly after succeeding, having devoted himself to the family art. Munefuyu (1613–1675) was the last head who both held the art at depth and taught shoguns — Ietsuna and Tsunayoshi. His son Munaharu died the same year he did; Muneari (1654–1689) followed; then Toshikata (柳生俊方, 1673–1730), Munaharu’s son adopted by Muneari, succeeded in 1689 as a teenager.
The pivot is 1730. Toshikata’s own succession failed three times over: Munemitsu (b. 1692, from the Okabe house of Kishiwada) was disinherited in 1708; Norimichi (1705–1721, from the Ikeda house) died at sixteen; and the succession finally passed to Toshihira (1699–1768), a son of Matsudaira Sadashige. Toshihira — an eleventh son of the Hisamatsu-Matsudaira house — took up the headship of the 10,000-koku Yagyū domain and the shogunal fencing-instructorship in Kyōhō 15 (1730). From that point the pattern is unbroken: every subsequent head came in as an adult adoptee from an unrelated house — Sanada, Matsumae, Matsudaira, Tanuma, and finally Takeda, from which Toshimasu, fifth son of the kōke hatamoto Takeda Nobuyuki, succeeded his elder brother Toshiyuki in 1862 as thirteenth and last lord. As one summary puts it, after the fourth lord the Yagyū bloodline was broken and every head thereafter inherited by adoption; the stipend never changed and no head held senior office — the family persisted less as a governing house than as a custodian of the school.
A hereditary technical transmission requires heads raised inside it from childhood. After 1730 the house never again had one, while remaining institutionally locked to the role — successive lords were resident in Edo permanently precisely in order to serve as shogunal fencing instructors. The title outlived its content by roughly 140 years; the office was still politically salient at the very end, since in the bakumatsu factional split within the domain the pro-bakufu party drew strength from the house’s standing as shogunal fencing instructor
The Shinkage-ryū of the Edo Yagyū house itself is described as being in a state of lost transmission (shitsuden), though several extant Shinkage lines descend from it. The best-known of these runs outside the house entirely: a transmission carried to Awa by Kimura Gōemon Yoshikuni, whom Munenori had sent before Sekigahara to watch the Chōsokabe, survives under the name Yagyū Shinkage-ryū and is practised at the Kubukan dōjō founded in 1905.
The Shinkage-ryū of the Edo Yagyū house itself is described as being in a state of lost transmission (shitsuden), though several extant Shinkage lines descend from it. The best-known of these runs outside the house entirely: a transmission carried to Awa by Kimura Gōemon Yoshikuni, whom Munenori had sent before Sekigahara to watch the Chōsokabe, survived for some time. There is also the Kyushu area Yagyū line whose densho I have previously studied.
Yagyū Munefuyu died in 1675 and the house then passed through a young head and a broken succession — meaning that during precisely Mitsunori’s outside-study window the live technical centre of gravity of Edo Yagyū practice already sat with the retainer lines rather than with the house. That makes an Unchū-ryū channel more plausible, not less, and it is also a reason the Nipponica formulation names a retainer school rather than a Yagyū.
Hypothesis:
I believe a line of Edo Yagyū Shinkage-ryū instead passed through Yamada Ippūsai into a revision of the Jikishin Seitō-ryū of Jikishinkai and then became what we call Jikishinkage-ryū today.
That is why Yamada chose the name Jiki Shinkage-ryū – as an expression of that continuation. This was later obscured by Naganuma Kunisato placing great empahsis on the historical figure of Matsumoto Bizen no Kami as a founder, replacing the accepted history of the bulk of Shinkage-ryū coming through Kamiizumi Ise no Kami from the Aisu Kage-ryū he studied. This was likely done to contrast Naganuma’s practice with both the suriving Owari line of Yagyū and factions of the Edo Yagyū Shinkage-ryū that were beginning to decline.
This may have been motivated by the revisions Ippūsai and Naganuma made to the art’s foundational practice. Ippūsai with Naganuma had substantially reworked the curriculum he learned, merging two lines of the art and in the process discarding much of the earlier Unchū-ryū (Yagyū Shinkage-ryū) kata such as Kūka, Empi and Tengusho. Without that technical content being transmitted, it was more suitable to point towards the Ogasawara, Okuyama, Denshinsai, Jikishinsai line and impute another founder than Kamiizumi Ise no Kami.
In essence, he did not return to his earlier tradition so much as take it up again in order to continue a line of his own, at a time when Yagyū was only passed down by hereditary means (or via adoption). A short amount of training to receive a final licensure after decades of absence reads closer to a master chosing to designate someone as their inheritor, versus a continued practice that maintained all of what was present at its inception.
This also would explain the modern day perspective among Jikishinkage-ryū practitioners that they are the true or correct line of Shinkage-ryū, and that there is not so much Jikishinkage-ryū and Hikita Kage-ryū and Yagyū Shinkage-ryū, but only Shinkage-ryū.
Jikishinkage-ryū then would actually date from between 1690 and 1718, during the interval after Takahashi Danjōzaemon Shigeharu (高橋弾正 左衛門重治) Jikishinsai has passed and before Ippūsai passed the art on to Naganuma Kunisato Shirozaemon. The subsequent line we inherit today then dates not to the imputing of Matsuomoto Bizen no Kami as its founder, but to the moment Naganuma made that choice.
