Chapter 37: The Age of the Samurai
Core idea
A military aristocracy ruled while the emperor reigned
For most of medieval and early-modern Japanese history, formal sovereignty belonged to the emperor in Kyoto — but actual political and military power belonged to the shōgun, a hereditary supreme general who governed in the emperor’s name. Below the shōgun stood the regional daimyō (great lords), each commanding a private army of samurai — armored, sworn warrior-retainers bound to their lord by hereditary obligation. This arrangement looked superficially like European feudalism, but its internal logic — based on Confucian and Buddhist ideas of duty rather than Christian vassal contracts — was distinctively Japanese.
A century of civil war produced the samurai myth
The Ashikaga shogunate (1336–1573) collapsed slowly through a succession crisis involving the heirless shōgun Ashikaga Yoshimasa, his reluctant monastic-turned-heir brother Yoshimi, and the late-born son Yoshimasa eventually fathered. The resulting Ōnin War (1467–1477) shattered central authority. The hundred-plus years that followed — known as the Sengoku jidai, the era of warring provinces — became the romantic backdrop against which the samurai code (bushidō) was later formulated. The image we now have of the samurai — disciplined, ascetic, contemptuous of death — owes as much to seventeenth and eighteenth-century moralists like Yamamoto Tsunetomo as to the bloody battlefield reality of the sixteenth.
Why it matters
Three unifiers, one country
The Sengoku jidai ended through the work of three successive warlords whose biographies Japanese schoolchildren still memorize. Oda Nobunaga (1534–1582) used early adoption of European firearms and tactical brutality to break the back of the old daimyō system before being assassinated by a treacherous general. His ablest lieutenant, Toyotomi Hideyoshi (1537–1598) — born a peasant, the only one of the three not from samurai stock — completed unification, conducted a sword-hunt that disarmed the peasantry, and attempted (and failed) to invade Korea twice. After Hideyoshi’s death, Tokugawa Ieyasu (1543–1616) defeated the Toyotomi loyalists at the Battle of Sekigahara in 1600 and was named shōgun in 1603. His family ruled Japan for the next two and a half centuries.
Sakoku: the closed country
By the 1630s, the Tokugawa shogunate had concluded that European missionaries, Christianity, and unregulated foreign trade were politically destabilizing — particularly after the Shimabara Rebellion (1637–1638) by Catholic-influenced peasants. The shogunate responded with sakoku (“closed country”) edicts that expelled most foreigners, banned Japanese subjects from leaving, prohibited Christianity on pain of death, and restricted foreign trade to a single Dutch and Chinese outpost on the artificial island of Dejima in Nagasaki harbor. For two hundred and twenty years — from 1639 to the arrival of Commodore Matthew Perry’s American warships in 1853 — Japan deliberately disconnected from the global system that was busy colonizing the rest of the planet.
Internal peace, cultural flowering
The Tokugawa peace — the Edo period (1603–1868) — was one of the longest stretches of internal stability in the history of any major society. Edo (modern Tokyo) grew to over a million people, possibly the largest city in the world by 1700. Kabuki theater, the ukiyo-e woodblock prints of Hokusai and Hiroshige, haiku poetry, and the formalization of bushidō as a literary tradition all flourished. The samurai, with no wars to fight, increasingly became a bureaucratic and scholarly class — at considerable cost to their economic position, since their fixed rice stipends did not keep up with a commercializing economy.
Key takeaways
Key takeaways
- Japan's emperor reigned but the shōgun ruled; samurai were sworn warrior-retainers of regional daimyō.
- The Ōnin War (1467-1477) collapsed central authority and opened the Sengoku jidai, a century-plus of civil war.
- Three unifiers ended the wars: Oda Nobunaga (broke the old order), Toyotomi Hideyoshi (completed unification), Tokugawa Ieyasu (won at Sekigahara, 1600).
- The Tokugawa shogunate (1603-1868) ruled Japan for 265 years from Edo (modern Tokyo).
- Sakoku edicts from the 1630s closed Japan to most foreign contact; only Dutch and Chinese traders at Dejima in Nagasaki were permitted.
- The Edo period produced kabuki, ukiyo-e prints, haiku, and the codification of bushidō — the warrior code — by figures like Yamamoto Tsunetomo.
- Sakoku ended in 1853 when US Commodore Perry's warships forced Japan to reopen; the Meiji Restoration (1868) abolished the shogunate.
Mental model
Read it as: A collapsing shogunate produced a century of civil war, which was ended by three successive warlords, each completing what the previous one started. The result — the Tokugawa peace — held for two and a half centuries before American warships forced it open. Stability was the deliberate product of a contained, isolated political system.
Key figures
Oda Nobunaga (1534–1582)
The first of the three unifiers. He was an early adopter of the matchlock arquebus introduced by Portuguese traders in 1543 and used it decisively at Nagashino in 1575, breaking the cavalry charge of the Takeda clan. He was betrayed and forced to commit seppuku by his general Akechi Mitsuhide at the Honnō-ji temple in 1582.
Toyotomi Hideyoshi (1537–1598)
A foot soldier of peasant origins who rose under Nobunaga to become his successor. He completed unification, conducted a national cadastral survey, separated the samurai class from the peasantry by the 1588 sword hunt, and launched two disastrous invasions of Korea (1592 and 1597). His death created the power vacuum Tokugawa Ieyasu exploited.
Tokugawa Ieyasu (1543–1616)
Patient, methodical, and long-lived. He waited out both Nobunaga and Hideyoshi, then crushed the Toyotomi loyalist coalition at Sekigahara in 1600. Named shōgun in 1603, he abdicated in 1605 to install his son Hidetada, but continued to govern from behind the scenes. The political system he designed — fixed daimyō domains, the sankin-kōtai alternate-attendance system that forced lords to spend alternate years in Edo with their families as hostages — held for 250 years.
Example: a daimyō under sankin-kōtai
Imagine you are the lord of a medium-sized domain in western Honshu in 1660. Every other year, you and your retinue of several hundred samurai must travel the Tōkaidō road to Edo and live in your designated mansion for twelve months. In the alternate year, you return home — but your wife and your heir remain in Edo at all times as effective hostages of the shogunate. The travel costs ruin your treasury; the obligation to maintain two households drains it further; and any plan you might once have had to raise an army against the shogun is impossible while your family is in his capital. Multiply this by two hundred and fifty daimyō, and you have a political system that delivers stability through forced expense and built-in surveillance. The Tokugawa peace was real, but it was engineered.
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