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※画像はイメージです。Narita Ujinaga
成田氏長（1542-1596）は戦国時代から安土桃山時代の武将・大名。藤原氏の流れを汲む成田氏の当主で、上杉謙信や北条氏など複数の勢力に仕えた。忍城の有名な防衛戦の実施者として知られ、関東の重要な領主として活躍した。
天文11年（1542）生まれ。永禄6年（1563）に父の隠居により家督を継いだ。弟の長忠との家督争いがあったが、重臣の支持を得て実権を確立。永禄12年（1569）の上杉謙信と北条氏の同盟により、北条氏の家臣として正式に認められた。
天正18年（1590）の小田原征伐では、本城の小田原城での籠城一方、家臣・成田長親の指揮で支城・忍城は石田三成の水攻めに耐え抜いた。北条滅亡後、下野国烏山城と2万石の領地を賜り、関東の重要な大名として認められた。
娘の甲斐姫は豊臣秀吉の側室となり、秀吉の寵愛を受けて一族の地位を高めた。文禄4年（1596）に没し、弟の成田泰親（長忠）が家督を継いだ。
Genroku Shintō — The Forging Style of Japan's Peak Aesthetic Era
Occupation Period and Sword Preservation
Regional Sword Culture After the Ōnin War
Reiwa Sword Renaissance
Emperor Go-Toba's Gobankaji System and Kikugyosaku — Imperial Sword Promotion in Late Insei Period
The Sōshū-den Inheritance and Development—Technical Transmission Beyond the Five Schools
Birth of the Tachi — Formation of the Curved Sword in the Mid-Heian Period
Shintoshin
Wakizashi Culture — The Aesthetic Sensibility and Social Order Cultivated by the Companion Sword
Post-Great Kantō Earthquake Period
Late Muromachi to Sengoku (Late Kotou)
Ashikaga Shoguns' Sword Collection and Higashiyama Artifacts
Early Tenpei Ancient Swords and Nara Imperial Workshops
The Kenmu Restoration and Swords
Gassan Tradition
Overview of the Shinto Era
Swords and Zen Buddhism—The Spiritual Foundations of the Samurai and the Philosophical Basis of the Way of the Blade
Mitsushina School
Mino Tradition
Sakoku and the Maturation of Sword Culture
Osaka Shintō
Yayoi and Kofun Periods
Sankin-kotai and the Regional Diffusion of Sword Culture
Nakago and Tang Inscription — Stylistic Evolution Through the Ages
Genroku-Kyōhō Peace Era
Kiyomaro School — The Bakumatsu Sōshū Revival and Its Disciples
Yoshino Court Swords
Hizen Tradition
The Kyohō Meibotsu-chō and the History of Japanese Sword Authentication
Bizen Tradition — The Greatest Sword-Making Province of Japan
The Hon'ami Family and the Sword Appraisal Tradition
Schools, Transmission, and Lineages in Japanese Swordsmithing
Era of the Shōchū and Genhō Disturbances
Daikei Naotane and Suishinshi Masahide—The Twin Peaks of Shinshintos
Polishers and Appraisers: A Lineage
Rise of the Uchigatana and Changing Sword-Wearing Customs
Kissaki — The Evolution of Sword Point Forms and Their Role in Appraisal
Kakitsu Era — The Kakitsu Disturbance and the Muromachi Sword Crisis
The Toyotomi Family's Legendary Sword Policy
Kamakura Middle Period Golden Age
Theoretical Foundations of the Shinshintō Movement
Konami no Hira—Kyushu's Oldest Sword School
Swords of the Kamakura Period (Overview)
Official Swordsmith System of the Edo Shogunate
Azuchi-Momoyama Period — Japanese Swords, 1568–1600
Yamashiro Smithing Decline in the Ōnin War Aftermath
Horimono — The Tradition and Design of Blade Engraving
Settsu Tradition
Sino-Japanese and Russo-Japanese War Era
Ainu and the Sword—Treasure Blades as Ikoro
Emishi Campaigns and Frontier Swords
Sue-Bizen (Late Bizen)
Kan'ei-Era Sword Culture
Jōkyū Disturbance Period
Jōji Era
Political Swords of the Ansei Era
Taisho Democracy and Japanese Swords
The Heisei and Reiwa Sword Boom
The Golden Age of Koto in the Kanpyo-Daigo Era
Swords of the Insei Period and Imperial Symbolism
Ashigaru and Retainers — Sword Culture of the Lower Warrior Class
Owari Seki — Mino Swordsmiths Who Migrated to Owari Province
Genroku Sword Culture
Falconry, Hunting, and the Sword — Short Blades in Warrior Custom
The Revival and Evolution of Modern Swords
Tenbun Hokke Uprising Period
Commoners, Merchants, and Swords—Edo-Period Military Arts Culture
An'ei-Tenmei Famine Era
The Osafune Workshop System and Formation of Sword Production Centers
Kanbun Shintō
Kyōhō Sword Revival — Yoshimune's Smith Reforms and the Provincial Smith Competition
Bunshō Era
Showa-to (Military Saber Period)
Shrine and Temple Dedication Swords and Shinto-Buddhist Synthesis
Heian-Kamakura
Fukuoka Ichimonji School
Ōshū Sword Tradition — Maigusa, Hōju, and the Ancient Blades of Mutsu
Kazari-tachi and Ceremonial Costume
Early Kamakura Period — The Birth of the Classical Tachi
Imjin War Period
Harima Tradition
Hosho School — Quintessential Masame Tradition Among the Yamato Five Schools
Tenpō Reform Period
Edo Period — Overview of Japanese Swords, 1603–1868
Yoshioka Ichimonji School — Splendid Choji-Midare of Bizen in the Late Kamakura to Nanbokucho Period
Kishu-Tokugawa Sword Culture
Swords in Noh and Kabuki Theater
Eiroku Era — On the Eve of Nobunaga's Ascent
Genna Era — Pax Genna and the Transformation of Sword Culture
Sōden-Bizen and the Cross-Tradition Technical Synthesis
Bakumatsu
Sonnō-Jōi and the Swords of Bakumatsu Activists
Taima School — Temple Smith Tradition of the Yamato Five Schools
Satsuma School
Late Kamakura Evolution
Iyo Tradition — The Foremost Sword-Making Region of Shikoku
Sword Culture of the Ryukyu Kingdom
Edo Shogunate Sword Legislation
Bingo Tradition
The Ōei Stability Period and Regional Smiths of Southern Yamashiro
Izumi-no-Kami Kanesada School — Mino Tradition's Bakumatsu Legacy
Enju School — Kyushu's Longest-Standing Rai-Lineage Smith Tradition
Postwar Sword Confiscation Era
Meiji Military Sword Era
Kyōtoku Era
Edo Shintō
Satsuma Rebellion Period
The Ako Incident and Swords of the Forty-Seven Ronin
Rai School
Kansei Reform Period
Women and Swords: Naginata and Kaiken
Mid-Edo (Late Shintō)
Ko-Ichimonji School
Ko-Mihara Tradition
Bunmei-Meiō Bizen Revival
Zenkunen-Gosannen Wars
Bungo Tradition
Kōnin-Jōgan Period — The Dawn of the Classical Japanese Sword
Toyotomi Hideyoshi's Katanagari and the Institutionalization of the Swordsmith
Tatara Ironmaking and the Material of the Japanese Sword
The Genpei Conflict Period
Genki-Tenshō Transitional Era
The Domain-Retained Smiths — Swordmaking Under Daimyo Patronage
Kenkyū–Kennin Era — Minamoto Yoritomo and the Birth of Kamakura Sword Culture
The Golden Age of Kyoto Sword Smiths in the Tenreki Period
Meiji-Era Sword Preservation Movement and Modern Collecting Culture
Gendaitō (Modern Art Swords)
Kanshō Era
Tenshō–Momoyama Sword Culture
Enbun Era — The Apex of Nanbokuchō Great-Sword Culture
Meiji-Taishō
Kenjutsu Schools and Sword Evolution
Taira Naval Forces and Sea-Battle Swords
Chōroku Era
The Sword Abolition Edict — The Day the Samurai's Soul Was Taken
The Enpō Legacy and the Transition to Hōreki Shintō
Jōkotō (Kofun–Nara Period)
Koshirae and Tōsōgu — The Culture of Sword Fittings
Hōgen-Heiji Wars Period
Early to Mid Muromachi
Shimada School and Suruga Sword Culture
Sakai Merchants and the Sword Trade
Tameshigiri — The Culture of Sword Testing
Keichō Shintō
Ayanokoji School
Echigo Tradition
Shoan Era
Echizen Tradition
Yamato Five Schools
Eikyo Era
Horikawa School
Kotetsu School
Eikyō-Kyōtoku Disturbances Period
Bunan Era
Ko-Bizen
Fujiwara Regency
Awataguchiha
Sukesada Lineage
Etchu Tradition
Kaga Sword Culture
Nara Period Swords
Meireki Era
Ko-Hoki (Ancient Hoki)
Establishment of Sagami-den
Swords and the Tea Ceremony — Japanese Blades in Wabi-Sabi Aesthetics
Genji Era
Jōhei-Tengyō Revolt Period
The Ōnin War and the Transformation of the Sword Industry
Beloved Blades and Gift-Sword Diplomacy of Sengoku Warlords
Kotō — Classical Japanese Swords
Early Shōwa Sword Renaissance
Go-Yoshihiro — The Supreme Master of the Soshu Tradition
Shikkake School
The Black Ships and the Transformation of Late Edo Sword Culture
Sekigahara and the Osaka Campaign: Swords in the Age of Unification
Keiō Era — The Final Swords of the Tokugawa Order
The Boshin War and the Japanese Sword
Hōki Tradition
The Mongol Invasions and the Sword Revolution
Tanto Dagger Tradition
Swords and Ritual — The Art of Wearing a Sword and Votive Blades
Swords in Classical Literature — From the Heike Monogatari to the Azuma Kagami
Ishido School
Bitchū Aoe Tradition
Swords of the Heian Period
Ōei Era — Muromachi Peace and the Ōei Swords
Tosa Tradition
Kaei Era — Sword Culture on the Eve of Perry's Arrival
Bunka–Bunsei Era
Imperial Household and the Tradition of Sacred Swords
Keian Era
Bunkyū Era — Swords Between the Sakuradamon Incident and the Shinsengumi
Hasebe School — Yamashiro-Based Masters of the Sōshū Tradition
Nagamaki Tradition
Sanjo School — The Oldest Yamashiro Swordsmithing School
Chikuzen-den — The Hakata Sword Tradition
Yamada Asaemon Executioner School
Nanbokuchō
Einin Era
Kōei-Jōwa Period — The Apex of Nanbokuchō Long Tachi
Hōreki-Meiwa Period — The Refinement of Shintō and the Flourishing of Sword Scholarship
Bunsei Cultural Flourishing and Sword Connoisseurship
Christian Daimyo and Their Swords
Hatamoto and Sword Culture — Swords of the Tokugawa Direct Retainers
Nanban Trade and Sword Exports
Mito Tokugawa and Imperial-Loyalist Sword Culture
Kannō Disturbance and the Sword
Rokuhara Tandai and Sword Administration in Late Kamakura
The Shinsengumi and Late Edo Localized Sword Culture
Swords of the Asuka Period
Yamashiro-den — The Kyoto Sword Tradition
Senjuin School
Sengoku Mass Production and Custom Swords
Shimabara Rebellion Period
Muromachi Shogunate and Sword Ritual
Tegai School
Swords of the Sengoku and Toyotomi Era
Postwar Shōwa Sword Innovation (1946-1989)
Swordsmith Schools of the Mid-to-Late Edo Period
Regional Sword Culture of the Nanbokuchō Period
Oshi Castle