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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。居城の忍城は小田原征伐での籠城戦（忍城の戦い）で知られ、氏長は関東の有力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、氏長自身は小田原城に籠城し、居城の忍城は城代の成田泰季とその子・長親らが守って石田三成の水攻めに耐え抜いた。北条滅亡後は蒲生氏郷のもとに身を寄せたのち、下野国烏山2万石に封ぜられた。
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。
Satsuma School
Occupation Period and Sword Preservation
Tatara Ironmaking and the Material of the Japanese Sword
Ōei Era — Muromachi Peace and the Ōei Swords
Zenkunen-Gosannen Wars
Early to Mid Muromachi
Chikuzen-den — The Hakata Sword Tradition
Yamashiro Smithing Decline in the Ōnin War Aftermath
Rise of the Uchigatana and Changing Sword-Wearing Customs
Mino Tradition
Sword Culture of the Ryukyu Kingdom
Jōji Era
Mukansa Swordsmith System
Sakai Merchants and the Sword Trade
Polishers and Appraisers: A Lineage
Early Tenpei Ancient Swords and Nara Imperial Workshops
Kyōhō Sword Revival: Yoshimune and Forging at Hama-goten
Nagamaki
The Genpei Conflict Period
Genroku Sword Culture
The Domain-Retained Smiths — Swordmaking Under Daimyo Patronage
Fujishima School
Late Kamakura Evolution
Higo Kinko — Sword Fittings Culture of the Hosokawa Clan
Man'en Era
Edo Shogunate Sword Legislation
Horimono — The Tradition and Design of Blade Engraving
Swords and Zen Buddhism—The Spiritual Foundations of the Samurai and the Philosophical Basis of the Way of the Blade
Japanese Swords at the World's Fairs and the Rise of Japonisme
Izumi-no-Kami Kanesada School — Mino Tradition's Bakumatsu Legacy
Early Kamakura Period — The Birth of the Classical Tachi
Birth of the Tachi — Formation of the Curved Sword in the Mid-Heian Period
Political Swords of the Ansei Era
Edo Period — Overview of Japanese Swords, 1603–1868
Muramasa School
Sekigahara and the Osaka Campaign: Swords in the Age of Unification
Namban-tetsu — Imported Steel and Japanese Swordsmithing
Yoshino Court Swords
Kōnin-Jōgan Period — The Dawn of the Classical Japanese Sword
Meitoku Era
Bakumatsu
Kannō Disturbance and the Sword
Genroku-Kyōhō Peace Era
Nobukuni School
Ōan Era Swords (1368–1375)
Eiroku Era — On the Eve of Nobunaga's Ascent
Emperor Go-Toba's Gobankaji System and Kiku-gosaku — Imperial Sword Promotion in Late Insei Period
Showa-to (Military Saber Period)
Awataguchiha
Gendaitō (Modern Art Swords)
Fukuoka Ichimonji School
Osaka Shintō
Taima School — Temple Smith Tradition of the Yamato Five Schools
Sukesada Lineage
Bitchū Aoe Tradition
Koka Era
Kansei Reform Period
Sengoku Mass Production and Custom Swords
Sonnō-Jōi and the Swords of Bakumatsu Activists
The Mongol Invasions and the Sword Revolution
Ko-Mihara Tradition
Nara Period Swords
Beloved Blades and Gift-Sword Diplomacy of Sengoku Warlords
Kakitsu Era — The Kakitsu Disturbance and the Muromachi Sword Crisis
Echizen Tradition
Bunka–Bunsei Era
Muromachi Shogunate and Sword Ritual
Postwar Sword Confiscation Era
The Meiji Sword Ban and the Beginnings of Sword Preservation
Tenshō–Momoyama Sword Culture
The Shinsengumi and Late Edo Localized Sword Culture
Army-Commissioned Swordsmith System and Yasukuni Swords
Samonji School
Date Clan Sword Culture — The Sendai Kunikane Lineage
Yayoi and Kofun Periods
Theoretical Foundations of the Shinshintō Movement
Ayanokōji School
Tenpō Reform Period
Women and Swords: Naginata and Kaiken
Meiji Military Sword Era
Sengoku Period — Japanese Swords, 1467–1573
Postwar Shōwa Sword Innovation (1946-1989)
Kenkyū–Kennin Era — Minamoto Yoritomo and the Birth of Kamakura Sword Culture
Era of the Shōchū and Genkō Incidents
Seppuku and the Ritual Use of the Tantō
Enbun Era — The Apex of Nanbokuchō Great-Sword Culture
Shizu School
Ishidō School
Sōden-Bizen and the Cross-Tradition Technical Synthesis
Yamashiro-den — The Kyoto Sword Tradition
Shinshintō
Hōgen Era
Sakoku and the Maturation of Sword Culture
Hōki Tradition
Tenbun Era
Horikawa School
The Black Ships and the Transformation of Late Edo Sword Culture
Gō Yoshihiro — The Supreme Master of the Soshu Tradition
Edo Shintō
Nanbokuchō
Ninpei Era
Kenchō Era
Genroku Shintō — The Forging Style of Japan's Peak Aesthetic Era
Uda School
Shimada School and Suruga Sword Culture
Bun'ei Era
Jōhei-Tengyō Revolt Period
Heiji Era
Yoshioka Ichimonji School — Splendid Choji-Midare of Bizen in the Late Kamakura to Nanbokucho Period
Bungo Takada School
Eikyō-Kyōtoku Disturbances Period
Kanshō Era
Chiyozuru School
Nanban Trade and Sword Exports
The Kyohō Meibutsu-chō and the History of Japanese Sword Authentication
Kyōtoku Era
Eiji Era
The Kenmu Restoration and Swords
Kamakura Middle Period Golden Age
The Toyotomi Family's Legendary Sword Policy
Keiō Era — The Final Swords of the Tokugawa Order
Regional Sword Culture of the Nanbokuchō Period
Shōtoku Era
Bizen Tradition — The Greatest Sword-Making Province of Japan
Ashigaru and Retainers — Sword Culture of the Lower Warrior Class
Heian-Kamakura
Jōkyū Disturbance Period
Koshirae and Tōsōgu — The Culture of Sword Fittings
Reiwa Sword Renaissance
Bunsei Cultural Flourishing and Sword Connoisseurship
Koji Era
Early Shōwa Sword Renaissance
Swords of the Sengoku and Toyotomi Era
Western Technology and Swords in the Bakumatsu Era
Einin Era
Kiyomaro School — The Bakumatsu Sōshū Revival and Its Disciples
Genji Era
Post-Great Kantō Earthquake Period
Bungo Tradition
Bun'an Era
Hatamoto and Sword Culture — Swords of the Tokugawa Direct Retainers
An'ei-Tenmei Famine Era
Ainu and the Sword—Treasure Blades as Ikoro
The Ako Incident and Swords of the Forty-Seven Ronin
Ashikaga Shoguns' Sword Collection and Higashiyama Artifacts
Yamada Asaemon Executioner School
Shrine and Temple Dedication Swords and Shinto-Buddhist Synthesis
Kaei Era — Sword Culture on the Eve of Perry's Arrival
Imjin War Period
Swords of the Asuka Period
Genki-Tenshō Transitional Era
Daiei Era
Ko-Bizen
The Revival and Evolution of Modern Swords
Azuchi-Momoyama Period — Japanese Swords, 1568–1600
The Ōnin War and the Transformation of the Sword Industry
Tosa Tradition
Hoei Era
Senjuin School
Meiji-Taishō
Keian Era
Establishment of Sagami-den
Meireki Era
Tameshigiri — The Culture of Sword Testing
Imperial Household Artist System and Swordsmiths
Kenjutsu Schools and Sword Evolution
Shoan Era
Tenna Era
Shikkake School
Swords of the Kamakura Period (Overview)
Hōgen-Heiji Wars Period
Swords in Noh and Kabuki Theater
Late Muromachi to Sengoku (Sue-kotō)
The Sword Registration System under Japan's Firearms and Swords Control Law
Ko-Ichimonji School
Tegai School
NBTHK — Japan's Sword Appraisal and Grading System
The Honnoji Incident and Its Swords
Ko-Hōki (Ancient Hōki)
Ko-Naminohira—Kyushu's Oldest Sword School
The Arrival of Firearms and the Transformation of Sword Culture
Rai School
Satsuma Rebellion Period
Kotetsu School
Swords and the Tea Ceremony — Japanese Blades in Wabi-Sabi Aesthetics
Muromachi Period — Overview of Japanese Swords, 1336–1573
Kazari-tachi and Ceremonial Costume
Hizen Tradition
Swords of the Insei Period and Imperial Symbolism
Kissaki — The Evolution of Sword Point Forms and Their Role in Appraisal
Eisho Era
Kyowa Era
The Sword Abolition Edict — The Day the Samurai's Soul Was Taken
Swordsmith Schools of the Mid-to-Late Edo Period
Manji Era
Jōkotō (Kofun–Nara Period)
Bunwa Era
Cultural Properties Protection Law and the National Treasure / Important Cultural Property Designation System for Swords
Sword Culture of the Nanbu and Tsugaru Domains
Taikei Naotane and Suishinshi Masahide—The Twin Peaks of Shinshintos
Uesugi Clan and Yonezawa Domain Sword Culture
Genna Era — Pax Genna and the Transformation of Sword Culture
Living National Treasure Swordsmiths
Gassan Tradition
Kishu-Tokugawa Sword Culture
Export of Japanese Art Swords and Export Inspection Certificate for Antique Art Objects
The Heisei and Reiwa Sword Boom
Kōei-Jōwa Period — The Apex of Nanbokuchō Long Tachi
Hasebe School — Yamashiro-Based Masters of the Sōshū Tradition
Official Swordsmith System of the Edo Shogunate
Sankin-kotai and the Regional Diffusion of Sword Culture
Fujiwara Regency
Owari Seki — Mino Swordsmiths Who Migrated to Owari Province
Mid-Edo (Late Shintō)
Kan'ei-Era Sword Culture
Nichimin Trade (Kangō Trade)
Schools, Transmission, and Lineages in Japanese Swordsmithing
The Sōshū-den Inheritance and Development—Technical Transmission Beyond the Five Schools
Wakizashi Culture — The Aesthetic Sensibility and Social Order Cultivated by the Companion Sword
Yamato Five Schools
Mishina School
Emishi Campaigns and Frontier Swords
Shimabara Rebellion Period
Keichō Shintō
The Osafune Workshop System and Formation of Sword Production Centers
Bunmei-Meiō Bizen Revival
Bunshō Era
Imperial Household and the Tradition of Sacred Swords
Taira Naval Forces and Sea-Battle Swords
Kotō — Classical Japanese Swords
Swords of the Heian Period
Swords and Ritual — The Art of Wearing a Sword and Votive Blades
Swords in Classical Literature — From the Heike Monogatari to the Azuma Kagami
Bingo Tradition
Bunkyū Era — Swords Between the Sakuradamon Incident and the Shinsengumi
Sino-Japanese and Russo-Japanese War Era
Kanbun Shintō
The Hon'ami Family and the Sword Appraisal Tradition
The Boshin War and the Japanese Sword
Enju School — Rai-Lineage Smiths of Higo
Overview of the Shinto Era
Sanjo School — The Oldest Yamashiro Swordsmithing School
Kaga Sword Culture
Taisho Democracy and Japanese Swords
Hōen Period
Ōshū Sword Tradition — Mokusa, Hōju, and the Ancient Blades of Mutsu
Sue-Bizen (Late Bizen)
Commoners, Merchants, and Swords—Edo-Period Military Arts Culture
Hosho School — Quintessential Masame Tradition Among the Yamato Five Schools
Nakago and Tang Inscription — Stylistic Evolution Through the Ages
Regional Sword Culture After the Ōnin War
Chōroku Era
Development of Commoner Sword Culture in Mid-Edo Period
Oshi Castle