Sankin-Kotai: The System That Shaped Edo

A rule that sent regional lords back and forth between their domains and the capital built highways, post towns and a thriving city.

Published October 18, 2026 at 11:40 PM JST | By Tokyo Paul

Quick answer: Sankin-kotai (alternate attendance) was a Tokugawa-era system, formalized in 1635, in which regional lords called daimyo spent alternate years in Edo and in their home domains, with their families residing in Edo. It spurred road building, post towns, inns and trade, and helped Edo grow. Nakasendo post towns such as Magome and Tsumago preserve its atmosphere.

What the System Was

Sankin-kotai means alternate attendance. Under the Tokugawa shogunate, daimyo were required to spend part of their time in Edo, the shogun's capital, and part in their own domains. Their wives and heirs generally lived in Edo, while the lord travelled back and forth in a regular cycle. The practice had earlier roots, but it was formalised for all daimyo in 1635 under the third shogun, Iemitsu, and continued, with changes, for more than two centuries.

Timing varied by domain, with the length of stay set by the shogunate. Domains in distant regions sometimes had different schedules from those near Edo. For the shogunate, the system helped maintain stability by keeping lords in regular contact with the capital. For the domains, it meant maintaining residences in Edo and a retinue for the trip. These demands shaped the economy of the whole country in lasting ways. The details changed over time, but the basic pattern of travel between domain and capital lasted for generations.

The Great Processions

When a daimyo travelled, he was accompanied by a procession of retainers, porters, bearers and officials. Larger domains sent hundreds of people, arranged in an order that displayed status. Banners, spears and chests moved along the roads in a colourful line. Travel took days or weeks depending on the distance, and arrangements were carefully planned. Advance parties booked lodgings and checked roads. Careful budgets covered food, fees and gifts.

Because processions were seen as representing the domain's dignity, they were conducted with great formality. Townspeople along the routes watched the processions, and the arrival of a lord could be a local event. The activity brought business to inns, shops and porters, and it gave ordinary people a glimpse of regional fashion and customs. Festivals in some post towns now recreate these processions in period costume.

Highways and Post Towns

To support the movement, the shogunate developed a network of highways radiating from Edo, known as the Five Routes. The best known are the Tokaido along the Pacific coast and the Nakasendo through the mountains. Along them stood post towns, shukuba, offering lodging, food, horses and porters. The Tokaido had fifty-three stations, made famous by woodblock print series, particularly the work of Hiroshige. The prints show travellers, landscapes and seasonal scenes, and remain widely loved.

Many modern towns along the route still carry the old post-town names. Special inns called honjin were reserved for lords and their senior retainers, while ordinary travellers used other lodgings. Checkpoints and rest stops regulated the traffic. The system created a steady flow of people, goods and news across the country. Stone markers and old signposts along the routes help modern walkers follow the path.

Economic and Cultural Effects

The costs were considerable for domains, but the effects on the wider economy were energising. Roads, bridges and ferries improved. Merchants supplied rice, cloth and goods to Edo households. Craftspeople and shopkeepers in the capital prospered, and the demand for supplies encouraged trade between regions. Culturally, sankin-kotai spread ideas. Samurai and retainers brought regional specialities to Edo and returned with new tastes, fashions and information. Local crafts and foods found new audiences.

Dialects mixed, and the capital became a melting pot of regional traditions. It also encouraged learning and the arts. Edo's theatres, bookshops and teachers drew people from across the country, and the movement of travellers helped distribute printed material. Many scholars regard this as one reason the Edo period was culturally rich. Post towns grew into lively centres of commerce and hospitality. The flow of money, goods and people made the Edo period a time of lively domestic commerce.

Edo's Growth

Because daimyo needed residences in Edo, large estates were built across the city. These mansions, often several per domain, housed families, officials and servants. A vast population of retainers and their dependants lived in Edo, increasing demand for goods and services. Townspeople supplied that demand as craftspeople, merchants, entertainers and labourers. The arrangement helped Edo reach a very large size, with a population commonly estimated at around a million in the eighteenth century.

Traces of these estates remain in Tokyo today. Some gardens once belonging to daimyo, such as those now open as public parks, preserve the design of the era. The grounds of the University of Tokyo's Akamon, a red gate, recall a lord's mansion. Many place names also hint at the past. The effect on the capital was lasting, and its layout still reflects the pattern of those estates. Today, many embassies, universities and parks stand on former estate lands.

Walking the Old Roads

Several stretches of old highway are popular for walking. The Kiso Valley section of the Nakasendo includes Magome and Tsumago, post towns preserved with wooden buildings and stone-paved paths. The walk between the two villages passes forests and waterfalls and is a favourite hike. Check seasonal conditions and bus schedules. On the Tokaido, the old cedar avenue near Hakone offers a shaded walk, and towns such as Seki in Mie Prefecture preserve historic streets.

Narai-juku in Nagano and Ouchi-juku in Fukushima show other styles of post-town architecture. Wear comfortable shoes and carry water. Many towns offer museums, small shops and rest stops. Local specialities, such as sweets or noodles, are a pleasant reward after a walk. Tourist offices can provide maps and suggestions. Local tourist information offices can suggest routes of different lengths for different abilities. Late spring and autumn give the most comfortable walking weather.

The End of the System

In the mid-nineteenth century, as Japan faced new pressures, the requirements were relaxed. In 1862, the shogunate reduced the obligation significantly, and families were allowed to return to their domains. Soon after, the broader political changes of the Meiji era ended the practice entirely. The legacy remains in the road network, place names and local traditions. Modern railways and highways often follow old routes, and festivals in some post towns recreate processions in costume.

Check local calendars for events. Understanding sankin-kotai helps explain why Japan's old highways are lined with such charming towns and why Tokyo grew as it did. A walk along one of these roads is a pleasant way to experience that history first-hand. Modern visitors can still follow the old routes by foot or by rail, which often runs close to them. Local museums in post towns display travel gear, maps and guidebooks from the period.

Frequently Asked Questions

What was sankin-kotai?

It was a Tokugawa-era system in which daimyo spent alternate years in Edo and their home domains, with their families living in Edo. It was formalised in 1635 and lasted for more than two centuries. The system shaped travel, trade and the growth of Edo.

How did it affect Japan's roads?

It encouraged the development of highways such as the Tokaido and Nakasendo, with post towns offering lodging, food, horses and porters. Many of these towns and routes can still be visited. Many of those towns still welcome visitors with preserved streets and inns.

Where can the old highways be walked?

The Magome to Tsumago section of the Nakasendo in the Kiso Valley is very popular, along with Narai-juku, the old Tokaido near Hakone and Seki in Mie. Check seasonal conditions and local transport. These routes suit walkers of many levels.

Keep Exploring

More guides from Tokyo Paul: Daily Life in Edo: Townspeople, Trades and Rhythms, Sakoku: Japan's Edo-Period Foreign Policy Explained and Oda Nobunaga: The Warlord Who Began Unification.