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| Sengoku jidai | |
|---|---|
| Name | Sengoku jidai |
| Native name | 戦国時代 |
| Start | c. 1467 |
| End | 1615 |
| Region | Japan |
Sengoku jidai The Sengoku jidai was a prolonged period of endemic conflict and political realignment in Japan from the late 15th to the early 17th century. It involved a diffusion of power among competing daimyō, intense military innovation, shifting alliances, and culminated in national unification under the Tokugawa shogunate. The era overlapped major events such as the Ōnin War, Azuchi–Momoyama period, and encounters with European trading powers like Portugal and Spain.
The immediate catalyst was the Ōnin War (1467–1477), which fractured the authority of the Ashikaga shogunate and provoked widespread daimyo autonomy, including prominent families like the Hosokawa clan, Shimazu clan, Ōuchi clan, and Mōri clan. Feudal institutions such as the bakufu and powerful offices like the Kanrei devolved as regional lords—Takeda Shingen, Uesugi Kenshin, Date Masamune, Hōjō clan—expanded influence. External pressures included the arrival of Portuguese explorers and the introduction of firearms, while internal strains involved succession disputes, land surveys by clans like the Asakura clan, and peasant uprisings exemplified by the Ikkō-ikki.
Early instability followed the Ōnin War, marked by fragmented contests among houses such as the Taira-aligned and Minamoto-aligned lineages earlier in history, later echoed by conflicts involving the Imagawa clan, Oda clan, and Azai clan. The mid-period saw consolidation by warlords like Oda Nobunaga and Toyotomi Hideyoshi, punctuated by battles including Battle of Okehazama, Battle of Nagashino, and Siege of Odawara (1590). The final phase encompassed clashes at the Battle of Sekigahara and sieges such as Siege of Osaka, leading to the establishment of the Tokugawa shogunate under Tokugawa Ieyasu and the promulgation of policies tied to the Sakoku era.
Central personalities included Oda Nobunaga, Toyotomi Hideyoshi, and Tokugawa Ieyasu, alongside rivals and allies such as Akechi Mitsuhide, Niwa Nagahide, Kobayakawa Takakage, Miyoshi Nagayoshi, Ashikaga Yoshiteru, and Ashikaga Yoshiaki. Influential clans comprised the Takeda clan, Imagawa clan, Hōjō clan (Later), Mōri clan, Shimazu clan, Uesugi clan, Asai clan, Azai clan, and Date clan. Religious and social actors like the Ikkō-ikki, Jodo Shinshu, Zen Buddhism, and Christian converts associated with Jesuit missions also played pivotal roles. Foreign actors included the Portuguese Empire, Spanish Empire, and merchants such as the Nanban trade participants.
Military transformation featured the adoption of the arquebus and matchlock firearms from Portugal, organized infantry formations exemplified at the Battle of Nagashino, and fortification advances seen in Azuchi Castle and Osaka Castle. Siegecraft, naval engagements involving the Kuki navy and Mōri naval forces, and cavalry tactics used by the Takeda cavalry were central. Logistics reforms included land surveys (kenchi initiatives under Hideyoshi), construction of roads and supply depots, and administrative measures like the sword hunt that controlled armament distribution.
The collapse of centralized Ashikaga authority facilitated daimyo bureaucratic centralization, land redistribution, and institutional reforms by figures such as Toyotomi Hideyoshi who instituted the sword hunt and separation edicts affecting samurai and peasantry. Social orders saw shifts among samurai, rōnin, and peasant communities, with uprisings like the Ikkō-ikki and policies addressing religious factions including Christianity in Japan and Buddhist sects like Jodo Shinshu. Administrative reorganizations led to cadastral surveys, stipend systems for retainers, and codifications affecting domains (han) under daimyo such as the Hosokawa and Maeda clan.
The period spurred castle town development around Azuchi, Osaka, and Nagoya, promoting urban growth and artisan networks linked to potters like those who relocated to Seto and Bizen. International trade expanded via the Nanban trade, linking ports such as Tanegashima, Nagasaki, and Hirado to merchants from Macau and Manila. Cultural patronage by Nobunaga, Hideyoshi, and Ieyasu fostered tea ceremony masters like Sen no Rikyū, Noh theatre performers, and artists associated with the Momoyama aesthetic. Fiscal measures affected rice taxation systems measured in koku and stimulated merchant classes in cities like Kyoto and Sakai.
Unification culminated with Toyotomi Hideyoshi’s consolidation after the Campaigns against the Hōjō and land reorganization, followed by Tokugawa Ieyasu’s decisive victory at Battle of Sekigahara and the elimination of Toyotomi resistance at the Siege of Osaka. The resulting Tokugawa shogunate instituted the bakuhan system, sankin-kōtai-like controls, and isolationist policies culminating in Sakoku that reshaped foreign relations with Portugal and Spain while permitting limited trade via Dutch East India Company channels at Dejima. The transition established a prolonged peace that defined early modern Japan and set institutional precedents for the Edo period.