What was sankin-kotai?

Sankin-kotai (alternate attendance) was the Tokugawa system requiring daimyo to spend alternating years at their domain and at Edo (the shogunal capital). This forced expensive travel and maintained hostages (the daimyo's family remained in Edo during his absence), draining daimyo wealth and preventing them from building independent power bases.

Daimyo: Japan's Feudal Lords

Q: What is the difference between a daimyo and a samurai?

All daimyo were samurai (members of the warrior class), but most samurai were not daimyo. A daimyo was a samurai lord who controlled a domain assessed at 10,000 koku or more of rice production. Ordinary samurai served daimyo as retainers, soldiers, and administrators. The daimyo was the top tier of the samurai class.

Daimyo (大名, literally “great name”) were the powerful regional lords who dominated Japanese politics and warfare from the late Muromachi period through the end of the Edo era. During the Sengoku period they were largely autonomous warlords; during the Edo period they were controlled by the Tokugawa shogunate but remained the governing authorities of their domains.

What Made Someone a Daimyo

The practical definition of a daimyo was a lord who controlled a domain assessed at 10,000 koku or more of rice production. The koku (approximately 180 litres of rice) was the standard measure of agricultural output and therefore of economic and military power. A domain of 10,000 koku could support a certain number of samurai retainers; the larger the domain, the larger the army. [history]

This was not a fixed legal status in the Sengoku period — domains expanded and contracted by conquest and alliance. A daimyo could grow from 10,000 to hundreds of thousands of koku through successful warfare, or shrink to nothing through defeat. [history]

In the Edo period, the Tokugawa codified the system: approximately 260-270 domains (han) were formally recognised, each governed by a daimyo family under Tokugawa supervision. [history]

Types of Daimyo in the Edo Period

The Tokugawa classified daimyo by their relationship to the Tokugawa house:

Shinpan (related houses): daimyo from collateral Tokugawa branches, including the three great houses (gosanke)
Fudai (hereditary vassals): daimyo whose families had served the Tokugawa before Sekigahara — trusted insiders who dominated the shogunate’s senior positions
Tozama (outside lords): daimyo who had submitted after Sekigahara — including many of the most powerful domains (Maeda, Shimazu, Mori). They were given large domains but excluded from shogunate administration [history]

Sankin-kotai

The Tokugawa system’s most effective control mechanism was sankin-kotai (参勤交代, alternate attendance). Every daimyo was required to spend alternating years in Edo (the shogunal capital) and in his home domain. [history]

The consequences were deliberate:

Cost: the annual journey with a large retinue, and maintaining residences in both Edo and the home domain, was enormously expensive — deliberately so
Hostages: when a daimyo was at his domain, his family remained in Edo
Surveillance: daimyo were under Tokugawa eyes for half their lives [history]

The system succeeded in preventing any daimyo from accumulating the wealth or independent power base needed to challenge the Tokugawa.

End of the Daimyo System

The Meiji Restoration (1868) abolished the domains. In 1871, the domains were replaced by prefectures under central government administration — a process called haihan chiken (“abolish domains, establish prefectures”). Former daimyo were absorbed into the new peerage system. The institution of the daimyo, as a governing lord of an autonomous domain, ended with the Meiji modernisation. [history]