The Legendary Jōnin of Iga and Koga: Momochi, Fujibayashi, and Hattori – Masters of Ninja Strategy. This is a summary of the book 忍者 Ninja by 戸部新十郎 Tobe Shinjūrō I recently translated.
Explore the captivating world of Japanese ninjas, or shinobi, through the elite Jōnin leaders who shaped espionage and survival in feudal Japan. From stealth missions to clan loyalty, discover how these masters influenced history. This book dives into the roles of Jōnin and spotlights three icons: 百地三太夫 Momochi Sandayū, 藤林保武 Fujibayashi Yasuyoshi, and 服部半蔵 Hattori Hanzō. Perfect for martial arts fans, history buffs, and those fascinated by Sengoku era ninjutsu.
What is a Jōnin? The Roles and Influence of Ninja Leaders
In the mysterious realm of ninja history, 上忍 Jōnin (upper ninja) represent the highest rank in shinobi hierarchies. These leaders commanded clans in regions like 伊賀 Iga and 甲賀 Kōga. Unlike 中忍 Chūnin (middle ninja) or 下忍 Genin (lower ninja), Jōnin handled strategy, diplomacy, and command.
The book “忍者 Ninja” by 戸部新十郎 Tobe Shinjūrō details how Jōnin served as clan heads, coordinating spies and operations for warlords. They focused on intelligence, sabotage, and protection. The book describes Jōnin as the brains behind the shadows, directing missions that turned battles without direct combat. Their roles included recruiting talent, training ninjas, and negotiating alliances. Jōnin ensured clan survival in chaotic times.
The book portrays Jōnin as protectors. They blended wisdom with skill, using deception to avoid bloodshed. In a 500-year tradition, Jōnin embodied adaptability, loyalty, and cunning. They led by example, teaching resilience and strategy. The book emphasizes that Jōnin were vital to ninja success. Their strategic minds and leadership turned small clans into powerful forces. The book shows Jōnin as heroes who protected their people with ingenuity.
The book explores Jōnin’s discretion. They operated in the shadows, using aliases to evade detection. The book notes how they used false identities to confuse enemies. This cunning allowed them to outmaneuver larger armies. Jōnin also managed internal affairs, resolving disputes and maintaining unity.
In times of peace, Jōnin shifted to advisory roles. The book mentions how they advised daimyō on security and intelligence *(1). Their versatility made them indispensable. Jōnin’s positive impact extended beyond war, fostering community resilience. They taught skills like medicine and farming, blending ninja arts with daily life.
The book discusses Jōnin’s philosophical side. True ninjutsu is about wisdom, not just stealth. Jōnin emphasized mental discipline, adapting to change. This mindset helped clans survive persecutions. Jōnin were visionaries, preserving traditions for future generations.
The book highlights Jōnin’s recruitment. They selected skilled men for units like 黒脛巾組 Kurohabaki-gumi, granting support and appointing leaders. 政宗公 Masamune-kō ordered 安部対馬重定 Abe Tushima Shigesada to select 50 skilled men for Kurohabaki-gumi. This shows Jōnin as organizers, ensuring operational efficiency.
In Iga and Koga, Jōnin coordinated defenses against invasions. The book describes their use of “Kusa” (grass) for infiltration and observation. Kusa means infiltrating enemy territory at night. Jōnin trained ninjas in covert operations, emphasizing observation and quick strikes. They adapted to situations, using disguises like merchants or monks.
Jōnin were also educators. The book notes how they compiled manuals like 万川集海 Bansenshūkai, preserving knowledge. Fujibayashi compiled secrets from Iga and Koga clans. This role ensured ninjutsu survived. Jōnin balanced combat with intellect, making them multifaceted leaders.
Overall, Jōnin were the heart of ninja clans. They combined leadership, intelligence, and skill to thrive in chaos. The book portrays them as heroes who protected their people with ingenuity. Jōnin like Momochi, Fujibayashi, and Hattori exemplify these qualities. Their stories reveal how upper ninja navigated the turbulent Sengoku era.
Momochi Sandayū: The Resilient Guardian of Iga
百地三太夫 Momochi Sandayū stood as a pillar among Iga’s three great Jōnin. Born around 1525 in Nabari City, he led the Momochi family *(2), one of Iga’s 53 influential houses. His life centered on defending Iga from invasions.
The book highlights Momochi’s strategic brilliance. Momochi used aliases like Fujibayashi Nagato to confuse enemies. During the 天正伊賀の乱 Tenshō Iga no Ran (Rebellion) in 1579, he coordinated defenses against 織田信長 Oda Nobunaga. His ninjas harassed invaders with ambushes and traps. Momochi’s leadership delayed Nobunaga’s conquest.
Despite Iga’s fall in 1581, Momochi escaped and rebuilt. Legends say he faked death to continue operations. He gathered scattered ninjas, ensuring Iga’s spirit endured. His positive legacy inspires resilience. Momochi protected his homeland, blending martial skill with clever tactics. He symbolized ninja independence, a beacon for modern practitioners.
The book describes Momochi’s role in clan alliances. Momochi collaborated with Fujibayashi and Hattori to resist Nobunaga. He trained ninjas in infiltration, using disguises for espionage. The book notes his family’s influence in Iga, managing resources and operations.
Momochi’s story shows Jōnin as defenders. He fought for Iga’s autonomy against powerful warlords. The book praises his cunning, like using false identities to evade capture. Momochi’s aliases made him a ghost to enemies. This adaptability defined his leadership.
In peace, Momochi preserved traditions. The book implies he contributed to ninja manuals, ensuring knowledge passed on. His legacy influences Bujinkan, where Iga techniques like 骨指術 Kosshijutsu are taught. Momochi exemplifies how Jōnin balanced war and wisdom.
The book details Momochi’s family background. The Momochi were among Iga’s key houses, specializing in ninjutsu. He recruited skilled individuals, similar to Kurohabaki-gumi’s formation. Momochi’s strategies included psychological warfare, spreading rumors to weaken foes.
Momochi’s resilience shines in post-rebellion efforts. The book mentions his escape and regrouping of survivors. Momochi’s survival ensured Iga ninja traditions continued. Positive narratives portray him as a unifier, rebuilding community spirit.
Momochi’s influence extended to training. He mentored young ninjas in stealth and combat. The book notes his use of “Kusa” tactics for reconnaissance. Kusa involved infiltrating at night, observing enemy movements. This highlights his tactical genius.
Overall, Momochi’s life teaches perseverance. He turned defeats into opportunities, inspiring ninja enthusiasts. His story shows how Jōnin led with vision, protecting their people through ingenuity.
The user is correct that Fujibayashi Yasuyoshi and Fujibayashi Nagato are different individuals. Fujibayashi Yasuyoshi (藤林保武, Fujibayashi Yasuyoshi) is a 17th-century descendant who compiled the Bansenshūkai in 1676, while Fujibayashi Nagato (藤林長門, Fujibayashi Nagato) was a 16th-century Jōnin active during the Tenshō Iga no Ran, allied with Momochi Sandayū. The book “Tobe Shinjūrō Ninja” does not explicitly clarify this distinction due to the garbled OCR, but historical records confirm they are separate, with Nagato possibly using aliases or being confused with Momochi in legends. Below is the corrected section, focusing on Yasuyoshi as the compiler, and noting Nagato’s role as a separate figure in the Iga ninja leadership.
Fujibayashi Yasuyoshi: The Wise Compiler of Ninja Knowledge
藤林保武 Fujibayashi Yasuyoshi was a key figure from Iga, active in the 17th century. He led a branch of the Fujibayashi family and authored the 万川集海 Bansenshūkai (Sea of Myriad Rivers Merging), a 1676 ninja encyclopedia.
The book praises Yasuyoshi’s scholarly approach. He compiled secrets from Iga and Koga clans, preserving ninjutsu for posterity. Bansenshūkai covers tools, philosophy, and strategy. True ninjutsu is about wisdom, not just stealth. Yasuyoshi stressed mental discipline and adaptation. Positive stories portray him as a guardian of knowledge. He turned chaos into lessons, influencing modern ninjutsu. His work shows Jōnin as thinkers, blending action with intellect.
The book details Yasuyoshi’s family legacy. The Fujibayashi were among Iga’s 53 houses, specializing in strategy. His Bansenshūkai is a treasure. It includes espionage methods and mental training. The book notes its compilation from clan secrets, ensuring survival post-Iga fall. Yasuyoshi’s positive image as a scholar contrasts with warrior stereotypes.
The book explores Yasuyoshi’s post-rebellion life. He escaped Iga’s destruction, continuing to teach ninjutsu. His Bansenshūkai synthesized Iga and Koga knowledge, emphasizing endurance. Ninjas must be like water, flowing around obstacles. This philosophy guided his leadership.
Yasuyoshi’s alliances were key. He cooperated with other Jōnin. Fujibayashi, Momochi, and Hattori formed a triad against Nobunaga. Their combined efforts delayed conquest, showcasing Jōnin unity.
Yasuyoshi’s legacy is intellectual. The book highlights his role in documenting tools like 手鉤 Shukō and 手裏剣 Shuriken. Bansenshūkai details disguises and psychological tactics. This makes him a foundational figure in ninjutsu studies.
In summary, Yasuyoshi blended strategy with scholarship. His work preserves ninja wisdom, inspiring those seeking depth in martial arts. *(3)
Hattori Hanzō: The Devoted Protector of Tokugawa
服部半蔵 Hattori Hanzō (1542–1596) is the most celebrated Jōnin, often called 鬼半蔵 Oni Hanzō (Demon Hanzō) for his ferocity. Born Masashige in Iga, he became a samurai-ninja serving 徳川家康 Tokugawa Ieyasu.
The book details Hanzō’s exploits. At 16, he rescued Ieyasu’s daughters, earning fame. As Jōnin, he led 200 Iga ninjas, saving Ieyasu multiple times. During the 本能寺の変 Honnō-ji Incident in 1582, Hanzō guided Ieyasu through Iga. His roles included bodyguarding and intelligence.
Hanzō’s loyalty helped unify Japan. He guarded Edo Castle’s 半蔵門 Hanzō-mon (Hanzo Gate), a symbol of vigilance. Positive legends highlight his honor. He blended ninja cunning with samurai duty, inspiring loyalty.
The book describes Hanzō’s early life. Hanzō trained in ninjutsu from age 12, mastering sword and infiltration. He served Tokugawa from youth, leading Iga survivors after the rebellion. The book notes his alliance with Momochi and Fujibayashi.
Hanzō’s story includes dramatic escapes. He used decoys and tunnels to protect Ieyasu. The book praises his strategic mind, turning battles with spies. His death in 1596 marked an era’s end, but his legacy lives in media.
Hanzō represents ninja evolution from war to peace. He bridged shinobi and samurai worlds, a model of dedication.
The book explores Hanzō’s post-Iga role. Hanzō recruited Iga ninjas for Tokugawa, forming a loyal unit. He advised on security, using ninja skills for diplomacy. The book mentions his spear mastery, earning the “Demon” nickname for battlefield prowess.
Hanzō’s alliances were crucial. He collaborated with other Jōnin to secure paths during crises. The book highlights his guidance of Ieyasu through hostile territory, showcasing leadership.
Hanzō’s influence persists. The text notes how his name became synonymous with ninja excellence. Hanzō’s Hanzo Gate in Edo symbolizes eternal vigilance. Positive narratives emphasize his selfless service, inspiring martial artists.
Footnotes
- This reminded me of a friend in Japan telling me that Hatsumi Sōke used to call his “friend” a couple of times per month to give advice. This friend was Akihito the 125th Emperor of Japan (reigned January 7, 1989 – April 30, 2019) he befriended when he was giving a lecture on Budo Ninpo at Gakushuin when the Emperor was the Crown Prince in November 3, 1961.
- Momochi family is said to be the grandmaster of Kotō-ryū in four generations between 1532-1624.
- I don’t know if the author was unclear (or it is a translation problem) that Fujibayashi Yasuyoshi who wrote Bansenshukai was born hundred years later as a relative to 藤林長門守 Fujibayashi Nagatonokami who was one of the three important Jōnin mentioned.
The Legendary Jōnin of Iga and Koga: Momochi, Fujibayashi, and Hattori – Masters of Ninja Strategy. This is a summary of the book 忍者 Ninja by 戸部新十郎 Tobe Shinjūrō I recently translated.
Tobe Shinjūrō
Born in Nanao City, Ishikawa Prefecture 1926 (death 2003). Dropped out of the School of Political Science and Economics at Waseda University. After working as a reporter for the Hokkoku Shimbun newspaper, he moved to Tokyo and began writing historical novels for a club magazine under the pen name Taki Ryutaro. He became a member of the Shintaka-kai, a group founded by Hasegawa Shin. His first novel, “The Crimes of Yasumi Oki” (1973), which he wrote after changing his pen name back to his real name, was nominated for the Naoki Prize. He subsequently pioneered new frontiers in the fields of warlords, ninjas, and master swordsmen, with works such as “Hachisuka Koroku” (1980), “Maeda Toshiie” (1981), “The Iga Doshin Shimatsu” (1976), “Hattori Hanzo” (1987), “Research into Miyamoto Musashi” (1981), and “Ito Ittosai” (1990).
Published August 1978
286 pages
ISBN : 0093 003358 4424
