Sankin-kotai (1635): Japan's System of Alternate Attendance

Sankin-kotai, or “alternate attendance”, was the system under which Japan’s regional lords, the daimyo, had to spend alternate years living in the shogun’s capital, Edo, while their wives and heirs stayed there permanently. Formalised in 1635 under the third Tokugawa shogun, Iemitsu, it lasted until 1862. It was one of the main tools the Tokugawa shogunate used to keep the more than 250 daimyo obedient, and it reshaped Japan’s roads, cities and economy.

Origins

After the battle of Sekigahara in 1600, many daimyo travelled to pay their respects to Tokugawa Ieyasu and left relatives with him as a sign of loyalty, a practice that already existed under Toyotomi Hideyoshi. As Edo grew into the political capital of the Tokugawa shogunate, lords built mansions there and attended the shogun more and more regularly.

In 1635 Tokugawa Iemitsu issued a revised version of the Buke shohatto, the Laws for the Military Houses. It made attendance in Edo a fixed duty for the tozama daimyo, the “outside” lords whose families had not been Tokugawa allies before 1600. In 1642 the rule was extended to the fudai, the hereditary vassals of the Tokugawa house.

How the system worked

Most daimyo spent one year in Edo and the next in their own domain, changing over at fixed times of year. Some were treated differently: lords near Edo often alternated every six months, while those far away or with special frontier duties, such as the Sō of Tsushima who managed relations with Korea, came less often.

Each lord maintained one or more large residences in Edo, with hundreds or thousands of retainers. His principal wife and his heir lived there all the time, so that a lord in his domain always left family members within the shogun’s reach.

The journeys took the form of formal processions, daimyo gyōretsu, with standard-bearers, armed samurai, porters and baggage. Their size depended on rank: small domains might send a hundred or so people, while the Maeda of Kaga, the richest lords, sometimes travelled with several thousand. Checkpoints such as the one at Hakone watched especially for guns entering the Edo region and for lords’ women leaving it, a concern summed up in the period saying iri-deppō ni de-onna, “incoming guns and outgoing women”.

Processions followed strict etiquette. Commoners along the route were expected to clear the road or kneel as a great lord passed, and rival processions had to avoid giving offence when they met. Domains planned the journey carefully, booking the official inns, called honjin, in each post town months in advance and hiring extra porters and horses along the way.

Effects on the daimyo

Alternate attendance was enormously expensive. Lords had to pay for the journey, the upkeep of Edo mansions and the display expected of their rank. Historians estimate that these costs took a large share of domain budgets, in some cases more than half, and many domains fell deeply into debt to merchants.

The system kept the daimyo busy, watched and short of money, and so helped preserve peace for over two centuries. In 1722, during a financial crisis, the shogun Tokugawa Yoshimune temporarily halved the required stay in Edo in return for contributions of rice, but the full system was restored in 1730.

Effects on Japan

Sankin-kotai helped make Edo one of the largest cities in the world, with an estimated population of over one million by the 18th century, roughly half of them samurai and their households. The demand of so many lords and retainers stimulated trade, crafts and services.

The processions also drove the development of the five official highways, the Gokaidō, with their post towns, inns and ferries. Samurai who spent years in Edo carried fashions, ideas, dialect and literature back to their home provinces, helping to create a shared national culture. Hiroshige’s famous print series The Fifty-Three Stations of the Tōkaidō (about 1833–1834) shows the road world that the system created.

Decline and end

By the 19th century the system was a heavy burden at a time of financial strain and foreign threats. In 1862, during the Bunkyū reforms, the shogunate reduced attendance to once every three years for about 100 days and allowed lords’ families to return home. Many daimyo left Edo immediately, which weakened the shogunate’s control just as it faced a crisis following the end of sakoku. The system vanished with the fall of the shogunate in 1867–1868.

Timeline

• 1600: Tokugawa Ieyasu wins the battle of Sekigahara; lords begin attending him and leaving hostages.
• 1603: Ieyasu becomes shogun and Edo becomes the political capital.
• 1635: Tokugawa Iemitsu’s revised Laws for the Military Houses formalise alternate attendance.
• 1642: The obligation is extended to the fudai daimyo.
• 1722: Yoshimune temporarily shortens Edo stays in exchange for rice contributions.
• 1730: The full system is restored.
• 1862: The Bunkyū reforms reduce attendance to once every three years.
• 1867–1868: The shogunate falls and the system ends.

Why it matters

Alternate attendance was a simple rule with far-reaching effects. It secured Tokugawa control without constant warfare, turned Edo into a giant city, built a national road network and spread a common culture across Japan, laying some of the groundwork for the unified modern state that followed.